Boy, I am sort of glad that I found this posting. Glad at least that I am not the only one experiencing this issue. Mine starting the endless looping of full system scan at 9:30 AM when the system was waken (from hibernation) by the server for a daily incremental backup. I don’t use this computer during the daytime so didn’t really pick up on the issue until later this afternoon. I should have checked the forum but instead called for support which was a futile, exasperating waste of time. All that they could think of doing was to uninstall and then re-install. And they had the audacity to think that it was fixed when upon rebooting there was Avast in all its glory running a full scan that no one had called for.

I will do the manual edit to the ini file as was identified earlier in this posting (THANK-YOU!).

For those of you keeping score on this matter, this is a dual core Athlon running Vista SP2. Paid version of Avast Security Suite running without prior issues since 12/25/2010. Current version is 6.0.1000 with engine and definitions 110329-1.

1.all were “monthly” schedules for the 1st day of the month, or some were different? YES - first of the month at 12:00 PM
2.was it always the full system scan? (even though I don’t think this is relevant)YES
3.was your computer turned on during the DST change? was it turned off ever since that?
Hibernated at the time of the DST change but has been rebooted since that time without negative affect on Avast until today.
4.- all were avast! 6? YES