I'm confused about MRI's too, Frank. Everyone talks about active leisons, never had one.

Even when I managed to get an MRI scan within a few days of new symptoms - yes new leison, but it's already "inactive". Which probably explains the reason I have little warning when a new flare happens.
I do believe the wacky weather this summer has been hard on us. I've talked to other MS'ers in my area, and they've not had a good summer this year either.
Since I had no change, I've been listing reasons why certain SX's seem to flare on certain days. LOL, I do have a few that pop up for no apparent reason. Seems like it's just a grab bag the bod picks from to keep life interesting. But I've noticed a few that are specific to certain things. Spasms happen to me when it's really humid, for instance.
Take care of yourself.