ItsK1tty

it appears that the files could be corrupted during download. try downloading from official montoyo website

what do you mean? what error?

It shouldn't matter what launcher you use. What do you mean by "it doesn't work"?

Does anything pop up when you press f10?

Then you broke MCEF. Wipe your mods folder and install MCEF and WebDisplays from scratch.

I think what I meant is pretty clear

works with 1.11b

what have you tried to solve the problem?

@DANTEARCONTE can you please share us the log?

also try uninstalling all mods except mcef & WD, make a new singleplayer world, check if that bug still exists