I have a CV64/3D in my stock A4000ec030 (yeah it's slow...); it works fine here. I'd try changing to different screen modes. It seems wierd that your monitor is causing this. All I can suggest is a different PSU... I'm serious; flakey PSUs can cause all sorts of wierd intermittent problems. On one PC I repaird recently the PSU was responsible for the machine freezing every time the floppy was accessed...
Cheers,
- Paul
