Hi Yuan,
We are currently running 5.4 (Build 2010.12.1) on 2010. My IT department says that they are installing SP1 tomorrow morning and will likely upgrade to Quest Web Parts 5.5 at the same time. So, I'll end up with 2 more variables in my issue (unless it just happened to be fixed for SP1 + 5.5… wishful thinking 🙂 ).
Thanks,
Todd