Safari & eBay display problem

Thanks in advance for any suggestions you may have. I'm using Mac OS 10.6.6, Safari 5.0.4 and FireFox 3.6.13. I noticed these issues about a couple of weeks ago. When I look at an eBay listing in Safari, the button to add the item I'm viewing to my Watch List doesn't do anything but highlight. Also when I click on the Shipping and payments tab, the item location, carrier and cost aren't displayed. Only the Domestic handling time, Return policy and Payment details, but no carrier or cost info!

I've emptied the cookies, cleared the cache, reset Safari, quit and restarted it, and it still has those listing problems. Does anyone else have these issues?

Also when I look at the same ebay item in FireFox, everything displays perfectly and I'm able to successfully add the item to my Watch List by pressing the Add to Watch list button.

The issues are not just with one particular ebay listing. The issues are with all eBay listings. Thanks for reading this!