It only happens with Mudcat, and it happens on both computers at my 2 separate jobs, which run different versions of windows, have totally different servers and totally different security and firewall setups.
Since it's only Mudcat doing it I'm not going to go to the trouble of tracking down IT to get it fixed. If I can't figure it out on my own, I'll just continue to reset my cookie every morning.
Now, this morning everything was fine yet I changed nothing last night. We'll see what happens on Monday, I guess.