The most recent update for Thunderbird seems to have done something weird. When I try to load Thunderbird, it pops up a Google Calendar login dialog box. However, the box is blank, and it won't let you close it. Before this started happening, a small box popped up, and said something about one of the calendars being read-only. I didn't know why I was getting that message, had never gotten it before, so I just closed it. Now I can't open Thunderbird at all. I've tried shutting down, and restarting my computer, and now Thunderbird just hangs with this blank Google Calendar login box. Please help as I need my email!!!