If Drum kit is not set, on every “play”, returns to default

Sorry I don't really understand... Do you use the JJazzLab SoundFont (with the right Output Synth preset) ? This usually avoids this kind of issues.

Could you attach in the post the style file you're using ? I'll try to reproduce the issue, so please tell me the exact steps to do.

I also need your Output Synth configuration file: menu Help/About, note the "Netbeans User Dir." location. Go to this directory/<version>/OutputSynthFiles, and attach the Default.cfg file (unless you use another one, but most people don't).

thanks