The launch of Jailbreak without notice has also meant that developers can not update their apps, so right now there are very few tweaks running iOS 7. There are cases where certain applications may cause serious problems such as a loop of restarts, which can only be stopped by a hard reset (by pressing the home and power at the same time for several seconds). The structure on which many Cydia apps, MobileSubstrate called, work has not been updated and therefore it is not possible to run many applications. Again, this problem can only be solved by Saurik, the Evad3rs and developers. In the coming days could release updates and everything will start to run correctly.