@ahull
Can't really explain why you're getting these weird screens. If overlay is not up-to-date, that's probably because CHDK doesn't know which of the 2 bitmap buffers is the latest one.
If you want, you could upload full RAM dumps taken in a mode that has issues (for example 1 in rec mode, 1 in play mode). If you do this, use an empty card, and point the cam to something recognizable (full black or white liveview makes framebuffers hard to recognize). You can use 7zip to compress the dumps.
Is nafraf's source the latest one?