it seams tu run now:
pi2 => reset configuration to defaults and activated WPS on next boot – worked
pi3 => startet again with fresh sd-card, as reset to defaults didin’t work. Activated WPS on first boot – worked
My recommendation: use only WPS for the wifi setup! Do not follow the steps described on the download page. Do not manually fill in network und key via webinterface. Maybe that should be changed on the website.
I am really like the idea of max2play and i hope that the next steps towards multiroom-system won’t be that tricky…