I have just loaded photoshop CS4 as part of the master collection. When I use any of the brush, dodge, burn or other similar tools the brush starts to disappear as I enlarge it eventually disappearing. Even though this happens the tool still works even though most of the circle around the brush area is missing. Any tips on how I can stop this from happening.

Reported in another thread.

I think the fix was to update the video card drivers.

Thanks for that John - updating the drivers worked