Images in Rush projects have disappeared

Hi

I opened up all the projects I've created in Rush - they're basic and just 2 tracks: sound with jpegs added, all worked fine and I exported them, but now all the images have gone from the projects but are still in the Project Assets.

Now if I try to add any jpegs to any project (new or old) it is Unable to Load Preview and says:

Error Message

The video bit depth of this field is unsupported.

This is odd as these jpegs loaded previously when I created the projects.

The only project that is in tact is one that is lots of video cliips put together (1 track)

I did update Big Sur to 11.5.1

Hope you can help

Cheers

Debbie