Neal, this is an ‘old’ issue (or bug). I tried to search for Date of last scan and match it like a phrase and found a lot of threads about it:
http://forum.avast.com/index.php?board=1;action=display;threadid=2783
http://forum.avast.com/index.php?board=2;action=display;threadid=2849
http://forum.avast.com/index.php?board=2;action=display;threadid=4325
http://forum.avast.com/index.php?board=2;action=display;threadid=4544
http://forum.avast.com/index.php?board=2;action=display;threadid=4867
http://forum.avast.com/index.php?board=2;action=display;threadid=5865
Vlk explanation:
[i]Well… date of last scan in the Simple UI is only updated when a full scan is performed thru Simple UI. That’s correct…
The reason is that in the Enhanced UI it’s difficult to decide whether the scan was really full or not – i.e. to check if the scanning task covered everything it should to qualify for a full scan…
In short: it’s not a bug, it’s a feature…[/i]