Looks like the avastUI isn't fully refreshed to show the complete updates in the vpsupd.exe file as it isn't possible to subsequently get an incremental update for an off-line system.
So this looks like a possible bug in reporting what version is the latest in the UI when using the vpsupd.exe. Which would be 5 hours or more later depending on your time zone in Canada.
However, your images don't show the wildly different dates that you mentioned but one single VPS increment on the same day.
version that I installed was 6.0.1091 -- the current version of virus definition is 110419-0 of that install. I have done a manual update -- still shows 110419-0 if I do a reboot the version will change to todays release of virus update.
Larry
It also depends on when you download the version as I believe the release time is based on the European Time Zone. For me the incremental 110506-0 was released 06/05/2011 11:52:20.
But your images have only served to confuse me further (easily done). If these images are from one of your off-line systems, then I don't see how it can report an last update attempt as a manual update would be pointless. So presumably this is an auto update attempt which should fail as no connection is present and should show a red update failure pop-up.
These off-line systems should have the Updates for virus definitions and program set to Manual and you should set the avastUI, Settings, Status Bar, monitoring to reflect this so you don't get told they are switched off.