Yep, there's new stuff.
"New stuff" indeed!

Fortunately I have "user_data" dumps from before the upgrade and now a dump from an HSM-100 that I recently Excluded and then Included = the differences are many and varied, and no reason to enumerate here, other than one possibility:
variable="MultiChCapabilities"
value="1,33,1,49,2,33,1,49,3,33,1,49,"
variable="MultiChCapabilities" value="1,33,1,96,49,112,132,133,128,114,119,134,239,32,2,33,1,96,49,112,132,133,128,114,119,134,239,32,3,33,1,96,49,112,132,133,128,114,119,134,239,32,"
Regardless of that particular variable, the Exclude/Include device has far fewer variables, and I assume they are now appropriate variables; and more importantly passes last night's Heal and today's ADD2.5 tests.
Also regardless of any and all differences in variables, Excluding and then Including any malfunctioning device seems to fix whatever the problem is/was, at least in one case in my Vera2. Better than version regression or wipe-and-start-over, IMHO.
Now only a dozen or so more devices to Exclude/Include.....joy....
Hope this helps somebody,
bob