whenever the update includes a change to the program version, rather than just definitions, it requires a re-boot.
I have been taking priority defs ONLY for several months now. Given that it will soon go way of the Dodo, perhaps they're setting machines up for that? ![]()
Does anyone know why the latest batch of updates requires a reboot? This was a rare occurrence in the past if memory serves me right.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic