Strange error with WebRep

I opened my WebRep balloon to rate a site and a weird login dialog appeared with the information already filled for someone on the avast.com domain. Any idea what is causing this? I have attached a screenshot.

what browser is this you are having problems with?

I remember this being a bug with a beta version. You’ll need to redo a clean install of avast.

First download the appropriate program.

http://files.avast.com/iavs5x/avast_free_antivirus_setup.exe
http://files.avast.com/iavs5x/avast_pro_antivirus_setup.exe
http://files.avast.com/iavs5x/avast_internet_security_setup.exe

Then uninstall via the Control Panel.

Then boot into safe mode and use the avast uninstall utility found here : http://www.avast.com/it-it/uninstall-utility

Then install the version you downloaded.