Yeah, the factory reset is last resort. Unfortunately, I don't see what else one can do if a reinstall doesn't work.
Note, you only need to install coplate's version. The KUAL Booklet from snapshots doesn't work on the PW4.
To be safe, I'd try:
- uninstall KUAL Booklet (NiLuJe)
- restart
- install KUAL coplate
- restart