If you complete the following steps on the latest version of PhD, you will get this error message and your virtual photo will be unusable:
- Add layers to a photo by making an edit in Guided. Like add a frame template.
- Go to Edit and then crop the whole image by using Crop. Do not select "Delete cropped pixels"
- Confirm the crop and then go back to the Library
The image is now messed-up (thumbnail shows jumble of pixels/image) and you cannot edit this photo any more. If you select "Delete cropped pixels" this does not happen and everything is OK.
I know PhD says the right workflow order is Guided -> Edit but I don't think offering a crop in Edit that doesn't work really helps!

Opening and closing the program makes no difference, the photo stays broken.
Cheers,
Ed