Sigh. After a few turns (and a shock that I have lessened by building a few canneries) the light has apparently returned and everything is restored.
Now I have another issue.
I've released my agents into Babylon and it seems that the game does not recalculate armies properly. When speaking about units, defense and firepower, I overwhelm them completely. The game shows me that my army is at about 0.6 of that foe.
Also, my vassals break away every few turns, especially when I research a new military tech or increase my power, claiming, that I am too weak. They are usually ok with a new vassal pact in the same turn.
This does not stop the mod from being highly enjoyable, but does add a certain WTH value.