Replace usb30_force_enabled = u8!0x1 to usb30_force_enabled = u8!0x0 in /atmosphere/system_settings.ini
This helps me on 7.0.1. I'm using MacOS 10.14.3 and Android File Transfer app.
Version 1.3 working with ("pip3 install pyqt5" and "pip3 install qdarkstyle") before I updated to 1.5.1 for fist time. So it's not 64 bit problem. Exactly after updating from 1.3 to 1.5.1 fluffy.pyw starts crashing for me.
I found a thing, if I remove "pip3 uninstall qdarkstyle", versions 1.3...
Yes, of course. Version 1.3 worked before. But after update to 1.4.1 fluffy.pyw starts crashing. And now version 1.3 don't work anymore and crash like 1.8.0(