Actually, WebRep crashes IE9. 100% smoking gun repeatable:
1) Click on XML file in Windows 7 (32-bit) Explorer
2) IE9 loads and crashes immediately. 100%. Every time.
3) Load IE9 from start menu
4) Select Options, Manage Add-ins
5) Disable Avast WebRep
6) Try again to click on XML file in Windows 7. Problem gone. Click and load IE9 as many times as you want.
7) Renable webrep, problem comes back 100% repeatable.
Disable webrep, problem goes away 100% repeatable.
IE9 Version: 9.0.8112.16421
Windows 7 Professional SP1
Avast Internet Security 7.0.1426 (paid version)
(Not that big a problem for me because I don't rely much on WebRep. However, judging from similar posts, WebRep and MSXML do not get along well together. This seems to be a very reliable way for the Avast development team to recreate the problem and figure out what the problem is)