The title pretty much describes my problem exactly. I never had this problem with Avast before upgrading to the latest version, now I have been unable to get rid of it, despite various reinstalls and repairs. The about box shows the correct VPS version but there is no entry in either the logfile or the event log, with the exception of the very first (automatic) update, which is logged correctly. Furthermore, when I installed the program, the event log file which is supposed to be "c:\windows\system32\config\antivirus.evt" had its name truncated to antiviru.evt. I had to manually change to references to it in the registry in order for event viewer to see the file, as the registry references all pointed to antivirus.evt. The event viewer logs updates to the VRDB correctly, but manual updates to the VPS are not logged at all, anywhere, despite the fact that it is clear that they are being updated, as the version in the about box is changing and there is no error message of any kind.
Any ideas?