i have the same problem right now. my ipad air's battery drained so my ipad restarted in unjailbroken state. after restarting, i found that i could no longer run safari (force closes right when you open it)
when i go to settings > wifi -- the settings app freezes. same goes for settings > privacy
when i pull down the notifications screen, the ipad freezes and i'm stuck with no other option but to hard restart (home+sleep/wake)
i tried safe mode (power+vol up) and this didnt work
i tried to reset all network settings -- this didnt work
i tried to rejailbreak -- pangu just force closes immediately
safari doesnt work
googlechrome doesnt work
ONLY MOBILE DATA WORKS
i tried to connect the ipad to my mac and it wouldn't connect -- must be a bad cable problem
i am now trying to reset all settings (but it's taking forever to restart)
I would appreciate any help. I can't afford to lose my jailbreak as I use the ipad for work. H E L P ! ! ! !