Maybe, I saw a specific version listed for older releases, but couldn't find any specific info saying if forge was or wasn't 1.3.1 compatible with the latest/recommended. Hence I gave it a try, since it couldn't hurt. I figured it wasn't compatible, no big deal, just gotta wait for an update. Your initial response to this thread however suggested maybe it was supposed to be working. (As he stated he was using the latest version.)
Either way, problem resolved, keep on rolling with 1.2.5 for now. Hopefully you get 1.3.1 support going soon, and thanks for the hard work!