Desktop app startup GUI Grey out using JDK1.5 using -Xmx1152m

Hi,
We have a desktop swing app which works with JVM max heap size -Xmx1152m in JDK 1.4.2 without any problems. But using JDK 1.5, the GUI shows up in GREY and not repaint itseld even if we force repaint by minimising or being another windows over it.
However, there is no problem if we reduce the -Xmx size from 1152m to about 512m and this problem does not show up on all machines.
Is this problem anyway related to the following bug ?
http://forum.java.sun.com/thread.jspa?forumID=32&threadID=554377
We would appreciate if someone can help us fix this problem.
We compiled our source code with JDK 1.5 and run with JDK1.5 and we do not use any JDK 1.5 features. We want to use JDk 1.5 for our memory and performance improvements. Ours is a heaby memory usage app so we can not afford to reduce -Xmx to 512m from 1152m.
Thanks

It could be to a corrupt Video Driver or Microsoft DirectX driver on that machine and 1.5 is taking advantage of some new directx methods to speed up video rendering. May 1.5 is using more vram than 1.4. You could also try downloading and installing/or reinstalling the latest Microsoft DirectX drivers and the latetest video drivers for the Dell Optiplex GX280. After that carefully read the link I provided, it might provide you with some clue as to what is going wrong and you could experiment with other ddraw properties.

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Desktop app startup GUI Grey out using JDK1.5 using -Xmx1152m

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