I am having a similar problem. Just updated to 1.5.2 and Internet Explorer 6 will not open unless I hold down the Ctrl key, and sometimes not even then. Once an Explorer window is open, succesive windows will open from my Quick Launch with no problem. Once an Explorer window is open, succesive windows will open from my Quick Launch with no problem. I can't tell if this is a flaw or some kind of new protection, but I'd like to disable it, if possible. Otherwise, great product.
