Yesterday, I noticed that I have the same problem, though I was not able to add only in IE6(On my laptop I have IE8, which did not have the problem), so I went ahead and turned off my SSU module, which turned out to be the case. I had a wrong .htaccess file. In SSU module there is a SSU_check file, which can tell you exact content you need to put in your .htaccess. try it, it helped me)))