Missing files in Timelines

Hey,

I started working on a project, where I imported 4 hours of footage into 2 bins within the project. Everything was going as planned, made my first selects - from the first BIN, made my second selects - from the second BIN. I copy pasted the selected files to 2 different timelines, so I can go back to the initial selected clips. Then I further selected onto a 3rd timeline called fine selects, where I really narrowed it down what I wanted to use.
Finally I started to put together the video, and everything worked perfect.

Woke up the next day, and I encountered the problem, that in the first selects for BIN 1 and the second selects for BIN 2 and the Fine selects now say for 90% of the clips Missing Files...

Checked the media pool, everything works there, all the clips play smooth as they should. Tried re connecting them, tried updating the software, turning off the computer, none of these worked.

Now if I import all the media into a new timeline, everything works, but I really would like to get my selects visible, because it took like 6 hours to make the selects...
Also, I didn't change any file name, or any folder name on my SSD.

Is there anyone out there who encountered this problem, or maybe even know the answer to this mind field?
Would very much appreciate some help!

All the best,
Tom.

made my first selects

Describe your process here.

I started working on a project, where I imported 4 hours of footage into 2 bins within the project. Everything was going as planned, made my first selects - from the first BIN, made my second selects - from the second BIN. I copy pasted the selected files to 2 different timelines, so I can go back to the initial selected clips. Then I further selected onto a 3rd timeline called fine selects, where I really narrowed it down what I wanted to use. Finally I started to put together the video, and everything worked perfect.

Woke up the next day, and I encountered the problem, that in the first selects for BIN 1 and the second selects for BIN 2 and the Fine selects now say for 90% of the clips Missing Files...

Which hardware (CPU, GPU, RAM, disk I/O)? What specific version of Resolve (I assume Studio)? What OS? What source file codec? What timeline settings (res and fps)? How does your drive rate with Blackmagic Speed Test? How is the drive formatted and connected? Which GPU drivers are installed? What are your cache settings?

Are you using the Live Save feature in Prefs? Are you using any of the built-in automatic backup features? My suggestion is that you always try to manually backup a backup DRP session file just in case of disaster. It's rare, but it happens.