Similarly, I created a mod I spent over 60 hours on with six new civs, a scenario, new units, and new city states. I can't get it to work now that I loaded up the patch. At first I thought I must have put a mistyped character into the last set of changes I made. But I checked, and I loaded up an older version I knew to be stable. Nothing! Civ 5 no longer recognizes my new civs at all in the game or in the scenario builder in world builder. I am not very happy.
Anybody have an insight as to why this might be a problem?