One thing to note:
Some of these link checkers in antivirus might be getting in the way.
This site might help you detect strange agent settings.
http://whatsmyuseragent.com/
Magento - phpBB3 - Kunena - RokBridge Specialist
No Secure Tab posts unless requested.
Use the Thank You and Life Preserver Buttons!
Your signature is also great place for setup details...help us help you!
An easier option to check; type the following into the address bar:
javascript:alert(navigator.userAgent)
If you have a UA string as this: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; .NET CLR 2 then you are probably going to have problems on some sites, I know, cause I did
*Karma comes in many forms, my personal favourite is the random saucepan from the sky* J.Spencer 17-02-2009