Hi Gadget,
I'm using Firefox 2.0.0.11, set to automatically download and install updates. The RootsChat tool bar was fine until a few days ago but I can't remember whether Firefox had done an update just before then.
I also use Norton security, which is bang up to date, so I'm sure my PC is clean. I suspect it's related to Firefox in some way. It may right itself in due course.
In the meantime, I will just press the button to the right of the one I want!
Cheers, Roger