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hi, you don't have a functional JACK service on the default first audio device ("hw:0"); the relevant messages (from jackd, which is auto-started on a new qtractor session) are the following:

creating alsa driver ... hw:0|hw:0|1024|2|48000|0|0|nomon|swmeter|-|32bit
ALSA: Cannot open PCM device alsa_pcm for playback. Falling back to capture-only mode

You are here then suggested to try to work out to start the JACK server manually and test whether it ever succeeds and is stable. Please use yours truly QjackCtl or KXStudio's Cadence to make it happen. Only after you get all working fine you should retry and launch Qtractor.

hth.

Cheers