Paint brush circle breakup

When using paint brush at 25% of full screen in the editing window, the paint brush circle starts to break up at 400 pixels ie it shows only the upper left part of the circle. At 50% of full screen it does the same starting at 175 pixels.

Can anyone duplicate this on their machine. I run Photoshop CS4 on Wondows XP Pro SP2.

This is a serious problem for me since I use the paint brush much of the time.

Any suggestions?

Thanks,

Dennis Jacobsen

I have an Nvidia 7800GT video card and this issue was resolved for me by updating the video drivers to the latest version (178.24 for XP).

Hi Craig, I did as you suggested. Problem solved. Thanks much. Dennis