So the latest Optifabric version (1.9.6) broke Chat Heads again.. That's all I really have to say. Prior to 1.9.6, it was functional (last I checked was 1.9.2). Hope this gets resolved and thanks.

I gave it a go with OptiFabric 1.9.6, OptiFine G8_pre1 and Chat Heads 0.2.2 for what looks like a normal (working) result:

If you've got any logs from it not working that would be helpful to diagnosing what it going wrong for you