DavidR
16
The problem being the topic title mentions nothing about Pale Moon, if that is the issue with ccleaner. I find hard to understand why this ccleaner interaction would be limited to Pale Moon and Opera and not other browsers as well.
That said why would you have ccleaner clean avast files, have you tried actually unchecking those options in ccleaner and see if those browsers have a problem.
The only web shield related file in the avast folder is the Webshlock.txt this is the Web Shield Lock txt file in use for files locked whilst they are in the temp folder and being scanned.