What I mean is,
Log into eBay via thier sign in, check the "keep me signed in box" on eBay's sign in screen.
Than go back to AW and try updating or listing an auction.
When you say you can't check PoP3, do you mean in AW or eBay?
If it is in AW, you need to contact your internet provider and double check the settings your using in the email side of AW.
If it is in eBay I can't help you there, I use AW for all my auction work.
Doing a program resore is fairly easy and risk free. If you want to try that I can post the instructions Thom sent me.
BUT, if it's a corrupted database, you will need to contact Thom and he'll give you instructions on how to make a copy of your database to send him so that he can fix it.