Two videos on one track and sync issue

Just opened a project I was working on the other day, most video was out of sync by 9-24 seconds (it wasn't like that when I saved it). Where some video has moved forward 9 seconds, other parts haven't, and have subsequently been overwritten, but as I move the video back to where it should be, the 9 seconds of overwritten video comes back and fills the space. Graphically it looked like two videos were existing on the same track in layers. I don't know why Resolve is doing this, I've never had it before but it is absolutely mental.

I noticed that only the multicam clips have moved, not the standalones. All material is DNxHD and wav audio. There is still one clip that assures me it is 2+ hours out of sync but isn't. I'm worried about opening my other projects now.

Also, I always export a project after every session so I have versions. I opened the previous backed up version and the problem doesn't exist. So it looks like Resolve has done this on shut down or start up, and baked it into the project (when I quit without saving and reopen the error is there).

Resolve 15.0.08.037
Windows 10 Pro
Intel i7 6850 @ 3.6GHz
64GB ram
GTX 1080 Ti 11GB
480GB ssd C drive
120GB ssd cache drive
1TB ssd edit drive

My first thought is to upgrade. Bugs do get fixed.

My first thought is to upgrade. Bugs do get fixed.

That is my thought too, but where has this bug come from? Resolve doesn't have the ability to layer videos on one track, reminded me of their new feature where you squish down layers, maybe I've got some stray code trying to escape.

UPDATED: Here is a screen grab of the issue. The highlighted clip is one clip, not two videos linked together. When I deleted the middle un-highlighted clip, the highlighted one is underneath, one solid clip layered below.

Resolve tries to play it back when double layered, you get mostly black frames, and then an actual frame.

You're not seeing all of your video tracks at the same time. That makes is difficult to really understand what's going on.

I think your first action should be a significantly larger, higher res monitor.

[Peter Chamberlain]

Zak, you are still on a public beta. There are 100 of changes since then.

I would first load your project back up from yesterday or Monday.
See if that opens correctly.
If so, export that drp and then use that to complete the project.

if not, you might try a major update.
Please back up your database. this is the protection for anything that goes wrong so never update this backup.
Export the drp for any active projects.
Import the backed up database and call it 15temp
make sure the projects load.
install v15 and update the 15temp database to the new v15.2 database.
check your project again.