Jim Simon wrote:BMD can't replicate the issue. They don't yet know what's causing it.
I have encountered it as well with 17. What I noticed is, about 5 hours into a session, I'd idly hit command-S and I didn't see the momentary hesitation I used to see. I checked the Project Manager page and was horrified to see that the "Modified" date and time was hours before... so everything I had done recently was not saved. Tried to export the session and got a warning: "You must save this session before you can export." (Was not using Fusion or Fairlight, only the Edit page and Color.)
Had I been thinking clearly, I would have started a new session and tried to cut-and-paste the timeline(s) into the new session, and I suspect that might have worked. As it was, I just crashed out, rebooted, and sure enough... the only session file in the Project Manager was the one from hours before. It was a one-time thing and I haven't experienced it since.
The other trick I might use is to export just the DRT Timeline, and maybe that would reflect the current changes. Hasn't happened again, so I haven't tried to replicate the problem.