Additional information:
I made log from xscreensaver:

##########################################################################
xscreensaver: 10:00:27: logging to "./screensaver.log" at Wed Aug  4
10:00:27 2010
##########################################################################

xscreensaver 5.10, copyright (c) 1991-2008 by Jamie Zawinski
<[email protected]>.
xscreensaver: 10:00:28: running as lennon/lennon (1000/1000)
xscreensaver: 10:00:28: in process 2420.
xscreensaver: 10:00:29: running on display ":0.0"
xscreensaver: 10:00:29: vendor is The X.Org Foundation, 10706000.
xscreensaver: 10:00:29: useful extensions:
xscreensaver: 10:00:29:   MIT Screen-Saver (disabled at compile time)
xscreensaver: 10:00:29:   Shared Memory (1.1)
xscreensaver: 10:00:29:   Double-Buffering (1.0)
xscreensaver: 10:00:29:   Power Management (1.1)
xscreensaver: 10:00:29:   GLX
xscreensaver: 10:00:29:   XF86 Video-Mode (2.2)
Xlib:  extension "XFree86-Misc" missing on display ":0.0".
xscreensaver: 10:00:29:   XC Misc (unavailable)
xscreensaver: 10:00:29:   Xinerama (1.1)
xscreensaver: 10:00:29:   Resize-and-Rotate (1.3)
xscreensaver: 10:00:29: screen 0 non-colormapped depths: 0 24.
xscreensaver: 10:00:29: WARNING: RANDR and Xinerama report different
xscreensaver: 10:00:29:                 screen layouts!  Believing RANDR.
xscreensaver: 10:00:29: screens in use: 1
xscreensaver: 10:00:29:    0/0: 1366x768+0+0 (LVDS0)
xscreensaver: 10:00:29: rejected screens: 1
xscreensaver: 10:00:29:    1/0: 0x0+0+0 (SDVO-1) -- output disabled
xscreensaver: 10:00:29: selecting RANDR events
xscreensaver: 10:00:29: consulting /proc/interrupts for keyboard
activity.
xscreensaver: 10:00:29: 0: visual 0x21 (TrueColor,   depth: 24, cmap:
default)
xscreensaver: 10:00:29: 0: saver window is 0x1800001.
xscreensaver: 10:00:29: selecting events on extant windows... done.
xscreensaver: 10:00:29: awaiting idleness.
##
## I activated screensaver by command: xscreensaver-command -activate
##
xscreensaver: 10:00:47: ACTIVATE ClientMessage received.
xscreensaver: 10:00:47: blanking screen at Wed Aug  4 10:00:47 2010.
xscreensaver: 10:00:47: 0: grabbing keyboard on 0x6a... GrabSuccess.
xscreensaver: 10:00:47: 0: grabbing mouse on 0x6a... GrabSuccess.
xscreensaver: 10:00:47: fading...
xscreensaver: 10:00:48: fading done.
xscreensaver: 10:00:49: 0: xscreensaver-gl-helper: GL visual is 0x21
(default).
xscreensaver: 10:00:49: 0: visual 0x21 (TrueColor,   depth: 24, cmap:
256)
xscreensaver: 10:00:49: 0: saver window is 0x1800008.
xscreensaver: 10:00:49: 0: destroyed old saver window 0x1800001.
xscreensaver: 10:00:49: 0: spawning "/opt/google/picasa/3.0/bin/
showpicasascreensaver" in pid 2423.
##
## Nothing happens, no photos, just blank screen, so I moved with
mouse and screensaver normally quits.
##
xscreensaver: 10:01:19: unblanking screen at Wed Aug  4 10:01:19 2010.
xscreensaver: 10:01:19: 0: killing pid 2423 (/opt/google/picasa/3.0/
bin/showpicasascreensaver)
xscreensaver: 10:01:19: unfading...
xscreensaver: 10:01:19: 0: child pid 2423 (/opt/google/picasa/3.0/bin/
showpicasascreensaver) terminated with signal 15.
xscreensaver: 10:01:21: unfading done.
xscreensaver: 10:01:21: 0: ungrabbing mouse (was 0x6a).
xscreensaver: 10:01:21: 0: ungrabbing keyboard (was 0x6a).
xscreensaver: 10:01:21: starting de-race timer (10 seconds.)
xscreensaver: 10:01:21: awaiting idleness.
xscreensaver: 10:01:31: de-race completed.

But when I run the same command as xscreensaver:
/opt/google/picasa/3.0/bin/showpicasascreensaver
It works.

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