This is one thing I wish I could understand. I get a corrupted cookie maybe once a year, and some people seem to have problems once a week. I think maybe you'll have fewer problems if you clear your browser cache and log in at Mudcat, and never log out.
As far as I can tell, cookie problems are almost always on the user's computer, and not at Mudcat Central.
So if you're a sloppy computer user, don't be. Do regular cleanup and maintenance on your computer, and ALWAYS shut down properly.
-Joe Offer - NOT Your Mom, although I suppose I'm nagging-