The Mezzmo app expects the server to provide a resource item in the response to the browse with the mimetype containing 'text/', 'smi/' or 'application/x-srt'. If there is no resource provided like this then no subtitles will be available. If you enable logging in the settings of the Mezzmo app then exit the app and start it again then browse to a file that should have subtitles and try to play it. Then go back to settings and disable logging. To get the log file you can try clicking View log files as this should launch an email app if it is available, otherwise you will need to install a file explorer like ES File Explorer then go to the sd card and in the Conceiva/Mezzmo folder you should find the logs. You will need to copy the logs to another location on the network that you can access from your PC then email the log to support [at] conceiva [dot] com and we can view the response from the server.