[Qt-creator] bug

[err0r]

bug#
processor:		amd64 5600+ 2xCore
video device:		nvidia 8600gt
operating system:	linux debian lenny/sid
wm:			openbox, fluxbox, xfce
qt-version:		4.4.3
qtcreator-version:	0.9.1 (Built on Dec 17 2008 at 00:49:41
			From revision 9cf4074504)

description:
	minimize the qtcreator window and then restore. the window appears blank(white). but all the gui is active, and begin to appear while being touched. also you can redraw the content of the window with another window dragging over it. version 0.9.0 does not have this issue.