Was Infuse 6.1.7 working ok with iOS 13.1? Or did you by chance do the update from 6.1.6 to 6.1.7 on Infuse and the 13.1 to 13.1.1 on the iOS at the same time? The two updates came out very close in time to each other.
I can say with certainty that 6.1.5 was running fine on all betas of iPad OS 13 including beta 13.1. Once the OS got to GM, I moved the device off the beta track as my own app development no longer needed it on that device.
I certainly have a large volume of content in my Infuse library (not coming from my network drive) (~850GB) but that hadn’t been a problem previously.
Let me know whether there is anything else you’d like me to check.
If Infuse is crashing back to the iPad home screen when launching it’s possible the last Infuse update got corrupted in some way. You may want to try deleting Infuse and reinstalling.
Now if Infuse is launching but crashing when trying to play you should let it crash and then on the next restart, instead of trying to play a video, go to the settings and send in the diagnostics as outlined here Troubleshooting and Getting Support – Firecore