Changes causes application

[Ratin]

Hi I have an X11 based application that renders video on the monitor
upon launch, sometimes when launched, the video does not start
rendering until mouse click event happens. The same code worked
perfectly fine with older X Org server version (1.6)
- only started happening with recent update to server 1.10 version
(along with NVidia driver update). I was wondering if anybody can give
me some clue as to what might cause this.