Same problems, HTC One M8, running FluentROM, Android 5.0.2, Sense 7. Pretty much unusable at this point. The exposure problems that were related earlier are still there. I just signed up a couple days ago so have only used the latest version.
Very cool app, shape recognition and importing images that have already been taken work very well. Focus doesn't seem to be functional though, which makes the only option for using it at the moment, importing already taken images. Running Android 5.0 on the HTC M8.