Thanks for all the help but it must've been something else as it randomly decided to work now. Thanks again though.
I think I know what the problem was, it may've been how I brought my old saves into it because I redownloaded put the save file back in and now it works.
I don't know if this bug has been reported yet, but, after beating Gnu the game doesn't proceed through the text after Gnu grabs you. This has happened every time I've attempted the fight so far.