ibooks crash on 5.1 Jailbreak

I know there was problems with iBooks crashing on the 5.0.1 JB and then apparently it was fixed with Redsn0w update. I've used the latest Redsn0w to JB my 5.1 iphone4. Now iBooks spontaneously exits (but does not crash), though every time you try to open app it seems like it tries to load the books then, the screen goes white and the app exits.

THE QUESTION:

Have any of you used the cydia hack that were used for when this happend the first time? How would I go about to do that? thanks.