First of all I will answer some of your questions. I am not very literate with computers, as you soon see.
I am using IE 8.
The antivirus is MS Security Essentials.
I have just installed Google Chrome as my browser, but the same problem is there.
One message that came up was "I.E.Script Error" code 0.
On the Ebay Watched / Purchased pages, nothing happens if I click More Actions, or Buy it Now etc.
I think the problem could be ebay itself, but I've tried to find an email contact to report it, but only phone lines seem to be available.
Please let me know what your opinion is.
Many thanks & kind regards,
Mike Crump. Blairgowrie, Scotland.