wrong dates on \"session created/last opened etc.\"

Maybe battery backup for clock is starting to go, but that usually sets your clock and year back to 1904.........but.. it's really some gremlins coming in the night, messing with you.

bump so nobody else has seen this problem? it seems to designate sessions from a few hours earlier in the day as "yesterday" ??????

That has nothing to do with ProTools, it's either something with your system clock or... who knows, but it's OS related. The finder/spotlight is responsible for those 'last modified' dates.