I own an iPad Air 128GB with 7.0.1 (evasi0n). Recently, after multiple crashes into Safe Mode, I was advised (http://cydia.saurik.com/safemode/) to download Crash Reporter. (http://cydia.saurik.com/package/crash-reporter/)
It seems there was conflict between two tweaks for the Control Center (Polus and CCControls). Crash Reporter notified me after the Settings app crashed, that something called “Preferences” was suspected.
I removed just CCControls then resprang. What resulted was my iPad booting to the Apple logo, flashing blue, then rebooting again. š
I followed what was advised in this ModMyi Guide. (http://modmyi.com/content/16123-how-put-your-jailbroken-ios-device-into-safe-mode-remove-conflicting-tweak.html)
It worked! I booted to my Home Screen without tweaks running. I played around with it in this mode for the day, scared I would reencounter that dreaded blue flash crash if I resprang/rebooted.
More: continued here