I’ve just installed clean workstation and put webpagetest agent on it. After had running some tests IE begun to behave abnormally. It does not open any URLs, just instantly displays message: “Internet Explorer cannot display the webpage” and window is moved to the left top corner of the screen. UrlBlast is stopped for sure. I rebooted this machine and problem is still present.
What is interesting, while testing with pagetest.exe everything works perfectly.