I tried this mod in the stable version of forge and I only can see black pictures. If I change to previus version the picture looks correctly.

Have you pressed play?

yes, although, it's a picture, not a video. And if i change the version and enter in the same world I can see it. (without pressing the play button)

more information: i tested in local and server, fails in both. Also I tried to put the frame in diferents blocks, change the size, change the picture...but it always black.

ok, it fails because optifine... I disabled optifine and now is working, could this be fixed? as i cant use rubidium i want to use optifine for the shaders, and the last version of optifine only works with the last stable version of forge.

I can't do anything about the issue with Optifine. I'm currently trying to get the issue with rubidium solved.

Update CreativeCore (new version should be available soon) and use rubidium instead. Crash should be fixed now.