Together with Windows version of grenpois0n RC5, the Chronic Dev Team has also released beta 3 of greenpois0n for Mac. This new version should solve a good part of the problems of the previous versions and can be run over an existing jailbreak with greenpois0n. I recommend you to take it and use it if you have problems with the jailbreak.
The new version also works on Mac OS X versions from 10.5.x up.
greenpois0n RC5 beta 3 can be downloaded from here.
