I'm guessing that at this point there's not much I can do other than try to find an alternative app or something because I don't necessarily think it's Graphenes fault, but I also don't really know.  

 I just tried Antennapod, works without a glitch.
Maybe a weird permission problem? 

 ¯\_(ツ)_/¯ if the issue persists I'll probably try the nuke and pave option and just reinstall graphene. See if a fresh install helps.  

 Maybe you can try to ask for help in the Matrix group