Having spent the last 30 minutes studying posts and searching on the curse of the missing VRDB icon, I am also suffering from this strange phenomenon.
I even looked at the screenshot which was posted by YLAP in June, 2005 and when I right click on my Avast icon I do not have anything at all relating to VRDB.
I did have the two icons when I installed Avast! and, as far as I know, apart from the usual scans, nothing has changed on my pc to make this icon disappear.
I even made sure I checked "customize notifications" to make quite sure it wasn't hidden.
I did not merge the "!" and the "a" when perhaps I should have done?
Maybe I missed something in the various posts on this subject. If I did, I apologise in advance.
Any help on this would be appreciated.