Update of "debugging"
In case streamtuner2 doesn't start up correctly, you can run it in a "debug mode". This is usually available via F12 in the Configuration window, in the "System" tab, as "Enable debug messages".
Now when streamtuner2 hangs at startup, you can't possible reach that. So there's a command-line flag alternatively.
Open a console / temrinal window
Enter following command:
And press Enter.
Watch the output for red error messages.
Disable a single plugin (once).
If it's just a single channel plugin that hangs at startp, you can just disable that per command line:
streamtuner2 -d xiph
To make that permanent open the configuration and press save.