Hi Kev

Apple Discussion thread suggests a Mobile Me cause.    May give you a pointer.

https://discussions.apple.com/thread/2547052

Cheers
Alan


On 07/04/2012, at 5:51 AM, Kevin Lock wrote:

Two icons in my dock (Firefox and Thunderbird) regularly shift position 
in the dock and sometimes completely disappear.  These icons are the 
most commonly used, but I can see no reason for them to move by 
themselves.   Any ideas for me?

Regards,

Kev
-- The WA Macintosh User Group Mailing List --
Archives - <http://www.wamug.org.au/mailinglist/archives.shtml>
Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml>
Settings & Unsubscribe - <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>

-- The WA Macintosh User Group Mailing List --
Archives - <http://www.wamug.org.au/mailinglist/archives.shtml>
Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml>
Settings & Unsubscribe - <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>