xone:K and Mixxx 2.0

Hy,

I'm using mixxx 2.0 on xubuntu 16.04 with a A&H xone:K2. The controller is normally compliant with mixxx 1.1 (http://mixxx.org/wiki/doku.php/hardware_compatibility) but i meet problems with the 2.0.

- When Mixx is started by launcher, it don't start and stop before the Mixxx windows.

- When Mixxx is started by command line the process stops here:

Debug [Main]: guess the size of the window decoration
Debug [Main]: DlgPrefVinyl::Apply
Debug [Main]: in VinylGainSlotApply() with gain: 0 dB
Debug [Main]: SoundManager::setupDevices()
Debug [Main]: SoundDeviceNetwork::open() "Network stream"
Debug [Main]: framesPerBuffer: 1024
Debug [Main]: Requested sample rate: 44100 Hz, latency: 23.22 ms
Debug [Main]: SoundDevicePortAudio::open() "2, XONE:K2: USB Audio (hw:1,0)"
Debug [Main]: framesPerBuffer: 1024
Debug [Main]: Requested sample rate: 44100 Hz, latency: 23.22 ms
Debug [Main]: Output channels: 4 | Input channels: 0
Debug [Main]: Opening stream with id 2
Debug [Main]: Opened PortAudio stream successfully... starting
Debug [Main]: Dynamically loaded PortAudio library
Note: nonZeroCount was 62468, is now 62424
Expression 'alsa_snd_pcm_prepare( stream->playback.pcm )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 2920
Expression 'AlsaStart( stream, 0 )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4212

Mixxx needs two or three tries (by command line) before to start and run. I've tried this (http://mixxx.org/wiki/doku.php/troubleshooting#mixxx_says_my_sound_card_does_not_support_the_sample_format) but without success.

Can you give me a solution or explain the problem.

Regards,
Stephen