WebShield was disabled when I powered up my Win7 laptop this morning. Clicking on the "Fix" button in the AvastUI did nothing. I next tried the repair thru Win7's "Uninstall a program" twice, rebooting after each attempt to no avail. I then shut the laptop down. My WinXP desktop didn't have the problem. I downloaded AshClear.exe and the AIS install with the intent to do a clean install on the Win7 laptop. However, on powerup, Avast WebShield was again working. I'll accept the small miracle.
Now, if WebRep will start working in Firefox 16.0.2 on Limited User Accounts on both machines I'll be happy. WebRep works on the Admin accounts on both machines now. WebRep worked for me until v7.0.1473 (it's just the last 2 updates that has the problem for me.