Now before we start discussing the merits of using the bcm wlan cards and their poor (or lack) of mon/ injection.... I know.
I have other cards for that.
BT4 final comes with the wl driver from broadcom... doesn't work
Downloaded and compiled from broadcom's site... doesn't work
in both cases, the only message recorded in the logs is that the license is unknown, or something, and the kernel is 'tainted'.
No other error, the wl module IS loaded.