Such a strange problem that I'm sure I'm missing something obvious.
I've not used messenger since I installed Windows 7 x64 Ultimate, but now I want to I can't. For some reason, even though it appears to be up and running with me logged in fine, it won't show me any IM's received or made. If I hover over the icon in the taskbar, I can see I have a conversation window open, but if I click on it, nothing happens. I can see the main page no problem, but never any conversation window.
I've tried uninstalling and reinstalling, but it's still the same.
Any ideas most welcome.