I've had a similar problem with version 1.3.1 !

It was found in UI/Effects/Transfer.  When target element with
display:none ,the function offset() return zero-valued top and left.

I've had found a temporary way to solve the problem.

/////////////////////////
jQuery.iUtil = {
        getPosition : function(e)
        {
                var x = 0;
                var y = 0;
                var es = e.style;
                if (jQuery(e).css('display') == 'none') {
                        var oldVisibility = es.visibility;
                        var oldPosition = es.position;
                        es.visibility = 'hidden';
                        es.display = 'block';
                        es.position = 'absolute';
                }
                var el = e;
                while (el){
                        x += el.offsetLeft + (el.currentStyle && 
!jQuery.browser.opera ?
parseInt(el.currentStyle.borderLeftWidth)||0:0);
                        y += el.offsetTop + (el.currentStyle && 
!jQuery.browser.opera ?
parseInt(el.currentStyle.borderTopWidth)||0:0);
                        el = el.offsetParent;
                }
                el = e;
                while (el && el.tagName  && el.tagName.toLowerCase() != 'body')
                {
                        x -= el.scrollLeft||0;
                        y -= el.scrollTop||0;
                        el = el.parentNode;
                }
                if (oldVisibility) {
                        es.display = 'none';
                        es.position = oldPosition;
                        es.visibility = oldVisibility;
                }
                return {x:x, y:y};
        },
.....
};
////////////////////////

These codes from http://interface.eyecon.ro ,It might be helpful to
settle this matter finally.

//////////Complete ////

/**
 * Interface Elements for jQuery
 * utility function
 *
 * http://interface.eyecon.ro
 *
 * Copyright (c) 2006 Stefan Petre
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 *
 */

jQuery.iUtil = {
        getPosition : function(e)
        {
                var x = 0;
                var y = 0;
                var es = e.style;
                if (jQuery(e).css('display') == 'none') {
                        var oldVisibility = es.visibility;
                        var oldPosition = es.position;
                        es.visibility = 'hidden';
                        es.display = 'block';
                        es.position = 'absolute';
                }
                var el = e;
                while (el){
                        x += el.offsetLeft + (el.currentStyle && 
!jQuery.browser.opera ?
parseInt(el.currentStyle.borderLeftWidth)||0:0);
                        y += el.offsetTop + (el.currentStyle && 
!jQuery.browser.opera ?
parseInt(el.currentStyle.borderTopWidth)||0:0);
                        el = el.offsetParent;
                }
                el = e;
                while (el && el.tagName  && el.tagName.toLowerCase() != 'body')
                {
                        x -= el.scrollLeft||0;
                        y -= el.scrollTop||0;
                        el = el.parentNode;
                }
                if (oldVisibility) {
                        es.display = 'none';
                        es.position = oldPosition;
                        es.visibility = oldVisibility;
                }
                return {x:x, y:y};
        },
        getPositionLite : function(el)
        {
                var x = 0, y = 0;
                while(el) {
                        x += el.offsetLeft || 0;
                        y += el.offsetTop || 0;
                        el = el.offsetParent;
                }
                return {x:x, y:y};
        },
        getSize : function(e)
        {
                var w = jQuery.css(e,'width');
                var h = jQuery.css(e,'height');
                var wb = 0;
                var hb = 0;
                var es = e.style;
                if (jQuery(e).css('display') != 'none') {
                        wb = e.offsetWidth;
                        hb = e.offsetHeight;
                } else {
                        var oldVisibility = es.visibility;
                        var oldPosition = es.position;
                        es.visibility = 'hidden';
                        es.display = 'block';
                        es.position = 'absolute';
                        wb = e.offsetWidth;
                        hb = e.offsetHeight;
                        es.display = 'none';
                        es.position = oldPosition;
                        es.visibility = oldVisibility;
                }
                return {w:w, h:h, wb:wb, hb:hb};
        },
        getSizeLite : function(el)
        {
                return {
                        wb:el.offsetWidth||0,
                        hb:el.offsetHeight||0
                };
        },
        getClient : function(e)
        {
                var h, w, de;
                if (e) {
                        w = e.clientWidth;
                        h = e.clientHeight;
                } else {
                        de = document.documentElement;
                        w = window.innerWidth || self.innerWidth || 
(de&&de.clientWidth) ||
document.body.clientWidth;
                        h = window.innerHeight || self.innerHeight || 
(de&&de.clientHeight)
|| document.body.clientHeight;
                }
                return {w:w,h:h};
        },
        getScroll : function (e)
        {
                var t, l, w, h, iw, ih;
                if (e && e.nodeName.toLowerCase() != 'body') {
                        t = e.scrollTop;
                        l = e.scrollLeft;
                        w = e.scrollWidth;
                        h = e.scrollHeight;
                        iw = 0;
                        ih = 0;
                } else  {
                        if (document.documentElement && 
document.documentElement.scrollTop)
{
                                t = document.documentElement.scrollTop;
                                l = document.documentElement.scrollLeft;
                                w = document.documentElement.scrollWidth;
                                h = document.documentElement.scrollHeight;
                        } else if (document.body) {
                                t = document.body.scrollTop;
                                l = document.body.scrollLeft;
                                w = document.body.scrollWidth;
                                h = document.body.scrollHeight;
                        }
                        iw = 
self.innerWidth||document.documentElement.clientWidth||
document.body.clientWidth||0;
                        ih = 
self.innerHeight||document.documentElement.clientHeight||
document.body.clientHeight||0;
                }
                return { t: t, l: l, w: w, h: h, iw: iw, ih: ih };
        },
        getMargins : function(e, toInteger)
        {
                var el = jQuery(e);
                var t = el.css('marginTop') || '';
                var r = el.css('marginRight') || '';
                var b = el.css('marginBottom') || '';
                var l = el.css('marginLeft') || '';
                if (toInteger)
                        return {
                                t: parseInt(t)||0,
                                r: parseInt(r)||0,
                                b: parseInt(b)||0,
                                l: parseInt(l)
                        };
                else
                        return {t: t, r: r,     b: b, l: l};
        },
        getPadding : function(e, toInteger)
        {
                var el = jQuery(e);
                var t = el.css('paddingTop') || '';
                var r = el.css('paddingRight') || '';
                var b = el.css('paddingBottom') || '';
                var l = el.css('paddingLeft') || '';
                if (toInteger)
                        return {
                                t: parseInt(t)||0,
                                r: parseInt(r)||0,
                                b: parseInt(b)||0,
                                l: parseInt(l)
                        };
                else
                        return {t: t, r: r,     b: b, l: l};
        },
        getBorder : function(e, toInteger)
        {
                var el = jQuery(e);
                var t = el.css('borderTopWidth') || '';
                var r = el.css('borderRightWidth') || '';
                var b = el.css('borderBottomWidth') || '';
                var l = el.css('borderLeftWidth') || '';
                if (toInteger)
                        return {
                                t: parseInt(t)||0,
                                r: parseInt(r)||0,
                                b: parseInt(b)||0,
                                l: parseInt(l)||0
                        };
                else
                        return {t: t, r: r,     b: b, l: l};
        },
        getPointer : function(event)
        {
                var x = event.pageX || (event.clientX +
(document.documentElement.scrollLeft || document.body.scrollLeft)) ||
0;
                var y = event.pageY || (event.clientY +
(document.documentElement.scrollTop || document.body.scrollTop)) || 0;
                return {x:x, y:y};
        },
        traverseDOM : function(nodeEl, func)
        {
                func(nodeEl);
                nodeEl = nodeEl.firstChild;
                while(nodeEl){
                        jQuery.iUtil.traverseDOM(nodeEl, func);
                        nodeEl = nodeEl.nextSibling;
                }
        },
        purgeEvents : function(nodeEl)
        {
                jQuery.iUtil.traverseDOM(
                        nodeEl,
                        function(el)
                        {
                                for(var attr in el){
                                        if(typeof el[attr] === 'function') {
                                                el[attr] = null;
                                        }
                                }
                        }
                );
        },
        centerEl : function(el, axis)
        {
                var clientScroll = jQuery.iUtil.getScroll();
                var windowSize = jQuery.iUtil.getSize(el);
                if (!axis || axis == 'vertically')
                        jQuery(el).css(
                                {
                                        top: clientScroll.t + 
((Math.max(clientScroll.h,clientScroll.ih)
- clientScroll.t - windowSize.hb)/2) + 'px'
                                }
                        );
                if (!axis || axis == 'horizontally')
                        jQuery(el).css(
                                {
                                        left:   clientScroll.l + 
((Math.max(clientScroll.w,clientScroll.iw)
- clientScroll.l - windowSize.wb)/2) + 'px'
                                }
                        );
        },
        fixPNG : function (el, emptyGIF) {
                var images = jQuery('i...@src*="png"]', el||document), png;
                images.each( function() {
                        png = this.src;
                        this.src = emptyGIF;
                        this.style.filter =
"progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + png +
"')";
                });
        }
};
////////////////
新年快乐!
///////////////

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