Every so often, say during some intensive work, when I move my cursor on the Superbar, the highlight of the button will stick even when the cursor isn't on it anymore, as if it's still highlighted. If I move my cursor over another button, the same happens. I have to reset explorer to continue, either by logging off or via Task Manager... is this a bug, to be fixed in SP1, or... a possible hotfix... let me know if the link doesn't work, to the image, I'll upload it somewhere else...

http://sphotos.ak.fbcdn.net/hphotos-ak-ash2/hs045.ash2/35630_145176752203982_100001349730636_219983_5884444_n.jpg

I have the latest drivers from Nvidia, as always, I've read that many have this issue across different versions of Windows.