UPDATE - FIXED - it turns out that now if you have your ttax data directory on a drive synched to Dropbox that you need to have Dropbox running before starting ttax. This is new behavior, as previously for 10+ years things worked just fine with the data locally and synched to Dropbox whenever Dropbox was intermittently started up as needed.
This broke Family Tree Maker similarly. In that case I got messages saying the data file wasn't compatible, and of course it was. Trying again with Dropbox running and it was fine.
Uncertain if it's Apple or Dropbox at fault here, but it seems this is 'not' a TurboTax bug. Just passing along the scoop in case others run into it.
(FWIW - I would hope TurboTax would just pop a 'cannot find file at path /something/here' dialog to tell the user what the issue is.)
