Bristle brush outline won't realtime render when painting

Question

Hello.
I recently upgraded to CS5 and was delighted to get to work with the new fantastic bristle brushes. I really love them...
Then when I started Photoshop a couple of days ago, they wouldn't work properly; partly because they act kind of twitchy while I move the cursor around, the angle modifier seems over-sensitive or something... but the biggest issue was that as soon as I begin painting, the brush outline goes static and won't adapt after the changes in angle etc, although the actual paint strokes will be affected as they should. This makes it hard to paint, and it wasn't like this before. It's not that the cursor goes to crosshair, I haven't accidentally pressed caps lock or something like that, no, the outline just stops the realtime rendering as soon as the pen tip is pushed.
This happened just a few days after me updating to Service Pack 1 (for Win7 x64 Ultimate). Could it have anything to do with this?
This is what I've tried so far:
*Resetting Photoshop preferences
*All different OpenGL modes (basic, normal, advanced). My GFX card is nVidia 8800GT 512 MB with the latest driver
*Of course, I run the latest Wacom driver for Intuos3
*I've also updated to PS CS5 12.0.3
So, summarized, I run:
PS CS5 12.0.3 on Win7 x64 Ultimate SP1
with latest Wacom driver
with latest nVidia driver
on the following hardware:
Intel Core 2 Duo E6750 2,66GHz
4GB DDR2 RAM @ 1002 MHz
GeForce 8800 GT 512 MB
Thank you very much in advance for any help; I've been googling for 8-12 hours without finding anything helpful, only some remotely similar problems.

Answer 1

Ah well, it was worth asking.
I've been running SP1 on Windows 7 x64 for over a month now and I don't see any brush issues such as you have described.  I don't use a tablet, though.  One's thoughts tend to go to whether the tablet driver might not be perfectly compatible with SP1...  Have Wacom said anything about an update?
-Noel