The photos appear to be in the right folder on my server and, as I said, I can view them from the ACP. However, they aren't in the Gallery for some reason.
If I try and rebuild the images, and I've tried several times, I get an Error message:
Error 500 - Internal server error
An internal server error has occured!
Please try again later.
I will update the vBGallery to the latest version soonest