Bitwig v2.1
linux Mint 18.1
using the new v5 script installed into ~/Bitwig Studio/Extensions my Akai APCmini worked first time but then refused to work at all no matter what I tried. $ lsusb identifies the device and dmesg|tail shows it enumerate, and I can read data from it (e.g. using midisnoop).
[edit 22/5/17 - it is possible that this "first" detection was due to BW seeing the device via the earlier v4 script which I had installed in readiness, and subsequent removal of the v4 script has resulted in not being able to detect the controller]
Installing the older v4 script in ~/Bitwig Studio/Controller Scripts and deleting the v5 "DrivenByMoss.bwextension" ... restarting BW immediately autodetected the APCmini and it worked well.
Trying the v5 script again, back in its correct location, and BW couldn't identify the device. Manually installing the device from the dropdown list shows the "DrivenByMoss" version to be available, but when I install it and configure it, the controller doesn't work. No lights, no onscreen response.
There seems to be some conflict between Alsa and Jack and APCMini - Alsa as the driver model allows v4 APCMini to be autodetected. Jack as the driver model does not allow BW to autodetect. Using v5 i(n either case) fails to be detected