Description: On login to server, client is kicked back to the menu screen. Works fine in single-player.

Relevant part of the server logs: fml-server-3.log [I can send the full logs if needed.]

On the client this appears on the screen when kicked:

Version: 1.0.0 Beta 12
Forge: 12.18.2.2105

Same issue here, running forge 12.18.2.2122.

Do we know what version of Java the mod was compiled against and also the Forge version tested against?

I'll be honest I've never tested against the latest forge server. I'll look to spin one up and try to find a fix.

What version did you test against, if you can remember that is ;). I'll give that a try as well...

The last version I tested was for forge 1.8... but that was beta 11 of the mod, not this version.