Failed saving config to /opt/retropie/configs/psx/retroarch.cfg

[LouF]

@kookamunga This worked for me too. Thx!
A lingeringing issue: one hotkey bind is acting doubley. E.g. I switched Reset and Take Screenshot, but now my new screenshot takes a picture AND resets the game; I figure it's from an additional configuration, somewhere.

[hhcasey]

I'm working to change the video settings in retroarch to best fit to the bezelproject artwork. I have about 400 games in MAME 2010 and had them all working fine then something happened and now, like others, I get the "Failed saving config to "/opt/retropie/configs/mame-libretro/retroarch.cfg" error message.

I've tried deleting the retroarch.cfg file
I've checked permissions and they're pi:pi

I've tried the suggestions listed here and it seems like most of the suggestions here, and over at the retroarch discord are just "try this and cross your fingers."

Surely someone knows what's going on and how to fix it.

pi model: 3b+, 128gb micro sd
power supply: 5.1v 3a
RetroPie version: 4.8
Built from: scratch
USB devices connected: Ultimarc I-PAC Ultimate I/O
Controller used: Ultimarc I-PAC set to keyboard emulation
Error messages received: Failed saving config to "/opt/retropie/configs/mame-libretro/retroarch.cfg
File: retroarch
Emulator: mame 2010