I can login just fine, but when I try to go to the last page I get kicked back to the login page. Both IE and Chrome.

And now I can not enter the page at all - it says "Your eBay account is not linked to the sniper." The app works fine at the same time.

Nevermind, figured it out

A few users reported that sometimes browser's caching may cause logout issues. You can either clean the cache or just do Ctrl+Refresh after you login to force it on that page.

Anyway, I'm glad you got it figured out quickly.
Thank you for your follow up and good luck sniping.