Perhaps you can do a bit of debugging for me then. Can you tell me where it's actually pausing? All you have to do is pause the CLAw and then step through it a little bit (F8) and let me know what part of the code it's in. Also, do a VarDump (Tools/VarDump) and PM that information to me.
I'm using Win7 (Vista without the Bloat) and I can run the combination for hours, so I'm not sure it's a vista thing. But since I can't/won't test on Vista-vista, if you can help that would be great!