This kind of gets into computer nerdery here, but I use the Firefox Noscript extension to filter out some harmful web tactics. Certain threads on TWT make NoScript unhappy, thinking it's a clickjacking attempt to EBay. Here's a pic:
Also - I see this less often but every once in awhile I get a small message (think it's a tiny popup window) about "Sorry for leaving ebay - would you take a survery?" but it's pretty rare and I didn't spend enough time figuring out when it happens. Think it's when I go from a thread to the College Wrestling board, but if it comes up again I'll document it better.