I get black bits, or at least I have in the past, and that was when the software was telling me I had the latest version installed but didn't (please see my previous post). It seemed to occur when you can tell Windows needs a full reboot (I hibernate my machine between sessions) and other things start to fall apart e.g. Explorer using too many resources etc., not just the visuals; you know what I mean?
I've just loaded Corporate and it's fine for me, for now. Saying that though, I have fixed my problem with WB (at least up to the last beta, I can only assume for the stable release that I also installed when prompted the other day) and I know that my video-card drivers are correctly installed. I mention this too because I also suspected that of being another possible reason for problems.
- For WB- my solution was to unload WB before installing manually from the installer again (v10.74). Right click on the WB icon in the notification area and click Unload Windowblinds.
- Before you reboot, make sure you have the latest nvidia drivers installed with GeForce Experience. It takes a while to install but if you don't get a confirmation message at the end that everything installed correctly there's a chance that something went wrong and so you'll need to try again. Persevere until it goes through fine. It may take a few attempts unfortunately.
If neither of these things work then it would probably mean something else is interfering in which case you will have to go through the cleanboot procedure.