Hi njeneb,
Well, I was trying it on a 5 or 6 year old 3 GHz P4, which is my main work PC. I only have it rendering with a single thread, it has HT but it generally slows it down.
Anyway, the number of threads shouldn't matter in this case. The TG2 UI is almost entirely single threaded. If you are trying to change settings while doing a full render then you will almost certainly crash.
For those who are shocked at my work PC ;-), I also run Windows on newer Intel Macs, but the P4 is the main one I use for Windows development. 64 bit Windows development will be happening on an 8 core Nehalem Xeon running Vista 64 or perhaps Windows 7. I just mention that because people like to tell me off about the machines I use ;-).
Regards,
Jo