Hi, see this post for some hints: MODEP, Pisound, WiFi, and You
If you have changed the default WiFi hotspot password, make sure you use a password that is between 8 and 63 characters, otherwise the hostapd will refuse to run. A check for this will be implemented soon in patchbox config utility.
You can check for errors by running:
sudo systemctl status hostapd
sudo journalctl -u hostapd