My thoughts are (not Alwil’s), if you are experiencing a problem, first ensure that you have the latest version (which you have). avast! differs from many programs by having a diagnostic repair function, so it can check for missing/corrupted files/install.

So if there are any errors/problems first ensure that things are up to date and functioning (repair), rather than chase an error/problem that may be resolved by an update/repair. Then if there is still a problem any report/log would be more relevant.