Last night a new version of iTunes release which breaks blackra1n jailbreak, or to be more specific blackra1n goes to not responding mode, when you launch it. But there is good news that this update has no affect on devteam’s product like redsn0w and PwnageTool.
Devteam’s MuscleNerd updated in his tweet that iTunes 9.1 safe for overall jailbreak, unlock, PwnageTool, redsn0w mac+pc, DFU mode, saurik’s server. And he also said in a sarcastic way that if blackra1n is broken,its not apple’s fault :P. Lets see what Geohot have to say about this and iTunes update..