There's something fishy about the 5k line of chips - mine used to work just fine, now it will neither work on my persistent install nor on an original image of bt4b booted from USB. Initially it'll run aireplay-ng -9 just fine, show injection, be happy, even smile at me on occasion (depending on the number of drinks consumed). However, when put into practice against my AP it will not inject for its life, nor will it pass the -9 tests (all come back @ 0%). I blame gremlins, or possibly some failsafe. Best part is, given the intermittency of the problem between different users, its rather hard to pinpoint where injection fails. Has anyone tested injection on the pre-final of BT4?