As far as I could see, the stats were working fine today in 3.6.9. It saved for me every time except the capital gauntlet mission we did first, and that isn't validated yet. The last time we tried a 3.6.10 game, the stats weren't working at all and it didn't seem to recognize the players properly (clicking on someone else's pilot would give an error, "pilot not found" or something like that), but that was two weeks ago.
There was some other strange behavior today though, like the ships in Breaking the Seal leaving very quickly and apparently only on the host's end. I have seen timing glitches like this occur in the past, but they're rare and not easily reproducible. There were also two occasions on which one person (Flint and then Fubar) was dropped with a CTD right as we were jumping, although I don't know if that was just a freak thing or what.