Has anyone experienced the following problem before with CW 3.1 (IDE version 5.5.4.1621)?

On my main development machine, the "Local Windows PC" list of the "Processes" window consistently remains empty, no matter what I do (i.e. regardless of running the emulator, and whether I have hit a breakpoint or not). This makes debugging of multi-threaded apps a bit complicated to say the least...

I have seen this work on other machines, but on this one (Windows XP SP2, user account with local admin rights) it was just like this from day one.

Any ideas what could be causing this?