DavidR
3
I would have thought that as you say if you do a generate VRDB now on a Thursday, the date of VRDB generation is stored somewhere (you can see when the VRDB was last run in the avast Simple User Interface detais). So with the avast.ini set to generate every 21 days, it must check something to confirm 21 days have elapsed from the last VRDB.
I would generate VRDB now, as you suggested and set the interval to 7 days (saves waiting 21 days to see if it worked). You could chose a shorter period and this would still confirm if it is acting on the actual date of last generation or some other date.
Hope this makes sense.