I have a Samsung Galaxy SII Epic 4G Touch with Sprint and after I upgraded to Jelly Beans, I could not get into settings at all. I would choose settings and then get the message "Unfortunately, Settings has Stopped." After reading the comments above, I tried turning off bluetooth and was able to get in just fine. Now, the only problem is I cannot get the phone to pair with my bluetooth headset. When I put the Plantronics headset into pairing mode and scan for bluetooth devices, it does not see it.
Okay, update. While posting this, the pairing expired on my headset and then, voila, my headset suddenly appeared in the device list as paired even though the headset said "Pairing unsuccessful, powering off." I powered the headset back on and voila again, it changed status to connected for both audio and phone. I then exited settings and tried to go back into settings and no problem.