Lunacy turns photos into blanks

I used lunacy to create a series of slides. I saved it and closed the file. Once I reopened the file, some of the images seemed to be missing. I checked the layers section to find that the images were there but they had somehow become blank. Please help.

Hi
Please provide your OS and Lunacy versions

And do you mind sharing with us your .sketch file? You can send it via private messages or drop right here.