To help me troubleshoot problems like this I wrote the script to save browser and system info. You posts say:

Microsoft Internet Explorer|Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.0.3705)|1024

This means you are using IE 6.o with WinXP.

Mine says:

Microsoft Internet Explorer|Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.1.4322)|1024

Which obviously means we are using the exact same OS and browser, but I’m having no problems whatsoever. The only explanation I can think of is what Carol suggested.