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I'm unable to start a co-op campaign in version 1.90 as Balthasar Gelt, with a friend who is play as Empire. No mods are active, and I've tried both co-op and head to head. I tried verifying my game's cache as well, and there were no issues. When starting any kind of multiplayer campaign as Solland (with my guest as the Empire, if that matters) it CTDs for me after pressing start. I've never seen this before in any situation in Warhammer 2.
I've confirmed that I can play multiplayer campaigns as Eltharion, so I know that this isn't happening for every faction.