Sounds like a browser/windows problem. When that happens, first thing to do is to reboot the system, and try a fresh instance of the browser.
M$ has a resource problem, and when it starts to get low, rather than warning people (or better yet FIXING the problem) they just start to have funky errors, and then crash or lock up. The first indication of a problem is click-links not working or buttons or fields not being drawn fully.
Same with cookie and authentication problems.
First thing to do is exit all programs and reboot. (COLD if you can).
If you are still getting the same errors, then it's worth looking at, but these are not really problems people have reported, and they seem to be only occuring with 'new' installs, so it might be external influences at work (such as the need to reboot).
http://www.postcards.com FAQ:
http://www.postcards.com/FAQ/LinkSQL/