Did it work?

So if you add an underscore manually, it will make another one

If you name it MainTex, the internal name becomes _MainTex automatically :)

Strange. You really shouldn't have that :(
Removing it should fix the issue, though you may have to re-assign all material parameters again

Did the shader property names have an underscore in SF as well? (I which case the internal name on the right of the property nodes, should show a double-underscore)

Oh, strange, looks like something went wrong when deserializing... Strange. Did you remove all the double underscores in SF or manually in code?

Cool, I'll try this tomorrow :) Thanks for the help

Interesting. I've done pretty much the same, but I haven't done the .Wait() part. Do I have to do it in a coroutine then, or does it work in both cases?

Awesome, thanks!

Do you have a version control system? If you do, it would be nice to see what changed in the shader from the time that it worked, to now