I can confirm this bug.
I have 6 desktops - 3*2, when I peek a window from desk (1, 1) and drag
it to left down corner of desk (1, 2), or right up of (3, 1), or right
down of (3, 2). I can't see one corner of it.
Ubuntu 8.10
compiz-fusion-plugins-main 0.7.8-0ubuntu2.2
compiz
** Attachment added: Screenshot.png
http://launchpadlibrarian.net/19808287/Screenshot.png
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[Compiz] Window disappear in Expo
https://bugs.launchpad.net/bugs/300307
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