I've run into the same problem.  I'm running Kubuntu Edgy with the ATI
drivers (Radeon 7000).

I did a google search and found a similar problem mentioned on a Fedora forum:
http://forums.fedoraforum.org/showthread.php?t=135181
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=213502

Following the instructions there, I appended the following environment variable 
to the command (running the package rdesktop 1.4.1):
$ XLIB_SKIP_ARGB_VISUALS=1 rdesktop ...

The problem went away.  This same fix is also used for a transparency
issue with compiz (not an issue for me).

I would suppose the fix probably involves something with the "XLIB ARGB
VISUALS".

-- 
slow redraw in window mode (fine in fullscreen)
https://launchpad.net/bugs/67179

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