While running drracket on Fedora Core 9, I got a bunch of stderr messages from 
Gdk:


cleme...@vogon:~/.racket/5.0.99.6 $ Gdk: gdk_window_thaw_updates: assertion 
`private->update_freeze_count > 0' faile
Gdk: gdk_window_thaw_updates: assertion `private->update_freeze_count > 0' faile
Gdk: gdk_window_thaw_updates: assertion `private->update_freeze_count > 0' faile
Gdk: gdk_window_thaw_updates: assertion `private->update_freeze_count > 0' faile
Gdk: gdk_window_thaw_updates: assertion `private->update_freeze_count > 0' faile
Gdk: ?gdk_window_thaw_updates: assertion `private->update_freeze_count > 0' 
faile
Gdk: @gdk_window_thaw_updates: assertion `private->update_freeze_count > 0' 
faile
Gdk: ?gdk_window_thaw_updates: assertion `window != NULL' faile
Gdk: ?gdk_window_thaw_updates: assertion `window != NULL' faile
Gdk: gdk_window_thaw_updates: assertion `window != NULL' faile
Gdk: ggdk_window_thaw_updates: assertion `window != NULL' faile
Gdk: @gdk_window_thaw_updates: assertion `window != NULL' faile
Gdk: ?gdk_window_thaw_updates: assertion `window != NULL' faile

[2]+  Done                    ~/drracket
cleme...@vogon:~/.racket/5.0.99.6 $ uname -a
Linux vogon.csc.calpoly.edu 2.6.25.3-18.fc9.i686 #1 SMP Tue May 13 05:38:53 EDT 
2008 i686 athlon i386 GNU/Linux

This was while testing the handin client.  I'm assuming these are unimportant, 
and in all likelihood related to the old libgdk that's a part of fedora core 9; 
if they're not, let me know and I'll try to reproduce them. Since the machines 
that my students will be using are all Fedora Core 11, I'm betting that I won't 
see this error again.

John

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