I am wondering if anyone else has experienced this issue and been able to resolve it.

I have an iPhone 5 and Pioneer X950BH, installed in May of this year, and everything was working fine up to about a month ago.

Now, the "rewind" and "fast-forward" buttons on the left strip are disabled, as well as the "play" and "pause" buttons on the screen itself, when I use the iPhone 5 as an iPod, either directly connected or via bluetooth. I went back to the installer, thinking it was a X950BH issue, but we were able to determine the issue is actually with the iPhone, because he used his iPhone and it worked just fine.

He suggested that I reset my iPhone to factory, and start from scratch. Short of that drastic move (which who knows if it would work anyway), I am wondering if I can find a solution here. Yes, I have forgotten the device on iPhone's blue tooth and reinstalled i that way, but as I said, its really not a bluetooth problem.

Any ideas on how to resolve this? Thanks in advance if you have a solution.

I have the exact same setup but I use Car Media Player (the AppRadio app).  How are you playing down media?  Are you using a different cable and using it as an iPod SOURCE input (not AppRadio)?  Just curious.

Yes, the installer put in a cable and a holder for the iPhone per my request. It took him a while to find one with a lightning connector. So the iPod source input is connected when I need the battery charged. When I am lazy and don't want to take off my Otter box (because it doesn't fit in the holder), I use Blue Tooth. Both work fine, except for when I wish to shuffle the songs, I can only navigate through the shuffle from the iPhone. The "rewind" (go to previous song) and "fast forward" (go to next song) are disabled now, whereas they worked before. Also, the "pause" and "play" buttons on the screen are disabled as well, whereas they worked before. It's really frustrating. I can't find a solution to the problem anywhere.

Is your phone jailbroken and have you installed any Cydia apps sense it worked properly?

Is your phone jailbroken and have you installed any Cydia apps sense it worked properly?

Nope. Won't ever jailbreak the phone, I'm a developer.