I've tried opening Flattened HD, fail.
I've tried opening Sizebox. Success, takes a couple of seconds but that's the content I have.
White screen is really annoying and is a blue screen essentially
Edit: Should mention I've tried both multiple times, and that I've tried a lot of troubleshooting. Nothing works to fix Flattened for me.
Edit2: And I only remember now that the previous version of Flattened was a flawless open