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If you're trying to post an item for auction, Safari is known to work like crap. My suggestion is to use Firefox or Camino when on eBay. I don't know what it is, but Safari and eBay don't play well together (at least when posting an auction).

If you're not posting, try clearing your browser cache and such.
 
This happens to me quite often as well, and I usually have to go all the way back to the eBay home page and start my search over. And I will agree that clearing the cache or resetting Safari helps.

Not a real "solution" but at least you know it's not just you.

D
 
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