I just realized, upgrading OSPi for some reason changes the port number…The system disabled error may be because the port has changed from 8080 to 80. Please check this and ensure the port is correct in config.php for the mobile app. If you need to change the port you can edit sd.json in the data directory of OSPi (it is the only fix I found).
Update: An update to OSPi has come out (Github) which should fix all left over issues between the mobile app and OSPi.