Even after an iPhone restart, I cannot currently add a task in OmniFocus. I tap on the add to inbox icon on the lower right, then type in my test name in tap save. Save grays out for a moment and then comes back and the screen is locked up. My storage shows 30+ gigabytes available.
FYI: I did try OmniFocus four on my Mac, but went back to OmniFocus three for now.