I'm not sure if this is where to report a bug.
Found some bug after flashing this and doing exactly as the instruction did.
- Clash of King game suddenly didn't work while other 5.1.1 Lollipop ROM from other phone work.
- Play Store stuck at certain percentage while downloading. Only way to fix it is by uninstalling the updates.
Sounds like a compatibility issue - i never ran into an issue with apps updating in play store.
You may also want to try a different set of gapps. I typically run with Banks and have no problems.