Windows 7 64 here too although I don't expect that would make a difference.

I think it did work once or twice but over the 6 months or so I have had it, it's hardly worked at all.

I've tried to logout, cleared cookies/cache/history, rebooted a number of times and no go. Now, all that said I went and cleared the history unchecking the "preserve data" option and it seems to be working (posting now from the machine). See how long it lasts before it happens again.