Please read this knowing that I'm not arguing with you! I'm just stating... facts I guess:
The developer of GravityBox told me personally 2 days ago that GB was not made for stock roms and was only made to work on AOSP roms. (It also says so on the download page of GB within Xposed Installer and on the official forum).
This doesn't necessarily mean that GB will not work, but just that it wasn't meant to work with our stock ROM. So if anyone has GB enabled and start having problems with their phone, the first thing to try is to disable GB.
I know for a fact that tons of G PRO users use GB without problems, so I'm not denying that it doesn't work. I mean, it worked for me back on Jelly Bean (using the JB version of GB obviously), and on my previous Optimus G Pro that had Kitkat, but got bricked. No problems at all! It's just that because the module wasn't intended for non-AOSP roms, a few small glitches might occur here and there.
Basically, you use GravityBox at your own risk.
The developer will not change the code to improve compatibility if you are having problems unless you are on an AOSP rom.
As for me, all I know is that incoming calls were not waking the screen and the ringtone was crackling. I had no way to answer any of my incoming calls. When I disabled GB, the problem went away immediately, and when I reenabled it, the problem came back. This was occurring without any of GB's phone tweaks enabled too.
I went to the GravityBox forum to see if anyone could explain this, but I got SEVERELY flamed by other people on there because I was not using an AOSP rom and still seeking help.
So just as a heads up: If you have a problem with GB and need help, ask on the OGP forums and not on the GB one. You will get punched, scratched, flamed, and kicked all around by the other members there.
I did get direct help by the developer though. He was nice and helped the best that he could. He concluded though that GB just wasn't going to work right on my phone, so I uninstalled it.
However, after the problems I was having with my phone yesterday without GB even installed, I do wonder now if the incoming call issue was actually due to something else, but exacerbated by GravityBox. I don't know, and I'm afraid to find out. I had to reflash stock entirely, and I'm now using G2 Tweaksbox and it's working great now, but wasn't before the reflash. It isn't intended for the OGP, but it was designed for stock LG roms, so there should be less chances of glitches. I'm just sticking to it for now.
I bet if I tried GB now though, it would work flawlessly.
So overall, my point is this:
I used to use GB without problems.
I just used the latest version of GB and it did give me problems.
GB is not intended for non-AOSP roms, so glitches and problems are possible.
My phone was severely messed up, so perhaps GB will work now that I reflashed everything.
I'm using G2 Tweaksbox now, which is designed for the LG stock rom (G2's though), so theoretically, there should be less chances of problems.
BTW: I searched for the OGP KitKat Fixer and can't find anything.
The only thing I am aware of that sounds familiar is the SD Fix app from the Play store, which restores write access to the external SD Card on KitKat. But I don't think this is what you are referring to because that has nothing to do with phone calls....
