I've been having a very serious problem ever since I updated a few days ago. My computer freezes after a few minutes of web browsing. I'm also on Vista and using firefox if that matters.
The web shield is obviously the one causing this. As another user has noticed, it scans like crazy. I'm up to 20000 items scanned in just a few minutes using 2223, whereas with the old version it'd be at 1000 max. No settings were changed.
I've tried doing a clean install and the problem was still there. Gone back to the old version for now and everything works fine again.