MSIE is a cookie monster. It eats up the cookies, then loses them -- or lies about them.
You can verify the problem by checking your site with Netscape (any version).
It will work when MSIE doesn't, and that sort of "proves" the cookie problem.
Jerry reported it a few weeks ago, and I've had it with MSIE and the GossamerMail program, but not with the MySQLMan program. But it's specific to MSIE (I'm only running 5.0 so I don't know about other versions).
There has to be a "fix" for it that has not propagated widely, since some sites are able to set cookies without a problem, but others are not. But, when you hit that error, I've found two ways to deal with it. Leave the page, unload MSIE, and wait a few minutes, and reload it and try again --or just reboot.
Considering it's _PROBABLY_ a windows problem more than an MSIE problem (Oh, I forgot, the two are unbundled now, aren't they.... <evil laugh>) it's a sign your system is becoming unstable and you need to reboot anyway. <sigh>.
http://www.postcards.com FAQ:
http://www.postcards.com/FAQ/LinkSQL/