I am not sure where to report this; but I discovered a bug in the current (4.2.1) build if Multibeast. It seems that that the Kext Utility Application no longer puts the new kexts in the correct location if you install all files to a USB Flash drive. I have always run my system this way, as it is easier to maintain; & also unaffected (to a point) by Apple Software Updates.
I hope this is addressed soon, as I will be going back to 4.1 until the Kext utility is straightened out. (I did not have this problem in 4.1 . . .)