X -query solaris10vm
start CDE session
click on one of the uparrows on the panel to expand it, launch something
note that you can interact with that application, reize etc.
go back to click on the panel
input is now frozen
Note that I can also reproduce this problem with FC12 xorg-x11-xserver-Xorg-1.7.5-1, so this doesn't seem to be a XWin-specific problem.
See also http://sourceware.org/bugzilla/show_bug.cgi?id=11301
I did a little bit of debugging and this seems to be caused by the VCK/VCP getting
frozen due a passive grab, but never thawed (presumably because the application never receives the event to cause it to request a thaw)
No longer reproducible with xserver 1.9.0, so this seems to have been fixed.