Firewall and antivirus checked

I can see the item pictures in any other of the 3 browsers on this computer. Problem has only occurred when I upgraded from Firefox 3 to Firefox 4. Now in Firefox 4 the box where the item picture displays will have a quick flash of the picture and then it disappears and a small circle of rotating dots is displayed in its place. Whenever I click on the bar with "enlarge" in it the whole display is blank, and when there is the option to "zoom" if I click on this and then mouse over the area where the picture should be I do get the zoom - but only ever on the first picture. If there is more than one I can click on any of the others but the zoom only goes to the first picture. Items checked after discussion with eBay support Cleared cache and history Checked speed of connection with service provider Firewall and antivirus checked Checked my account settings on eBay