It seems this commit MinecraftForge/MinecraftForge@ef0e0d7 does not play nicely with Carpenter's Blocks version 3.3.1. Forge version 10.13.2.1233 and higher cause Carpenter Blocks to render invisible. Invisible in the inventory and see through the world invisible when placed.

No console errors. Downgrading to forge 10.13.2.1232 fixes the issue.

For now just use whatever version of Forge is compatible. I'll test when I can get a chance.

Sure, no problem. :) It seems the forge commit also breaks some other mods like Chisel. So not sure if it is an issue in Forge or all mods need to update. Forge 1232 seems to be perfectly fine.

This is caused by Optifine. sp614x will have to update their mod to support the new changes in Forge.

Ah. That could possibly explain it. I use optifine in my mod pack. It also breaks a few other mods rendering in the creative inventory such as Chisel. But I assume also caused by optifine with that forge version. I'll stay on Forge 1232 in the meantime until Forge pushes a fix or sp614x updates optifine to be compatible.

Glad I could help.