Disabling Offset UI via Settings causes a non-recoverable error involving said UI. I disabled it from settings just to see what it did and when I tried to edit fast inserters it crashed. Twice now, just to make sure it was not a random bug.

Ill check and fix this right away

So...
I created a scenario, placed a bunch of inserters, (every type), and opened each GUI, I could not make it crash, I could only do it with shortcuts and I fixed that, let me know if the issue is still present for you after 2.0.8.

No such luck, I'm assuming it was some mod conflict? Though it doesn't make sense to me why this would happen because of another mod.

Thanks anyways ill let you know if somethin else happens