After getting the release code for leopard on my McBook Pro 17 last Friday I have tried numerous Parallels Desktop builds and can report the only stable one I have found so far on a fresh OSX install is build 4128. Yes it still has the disappearred icons in the taskbar but everything else is speedy and very stable. A warning though.... Do NOT run OSX out of memory or very low on memory as you'll hang finder and need to power off to get control again. Its not specific to Parallels as I can produce the same problem with several other apps too. Phil