Had a fright starting the Parthian campaign.

When I clicked the arrow taking me to each cityin the opening, the screen went dark and the settlement displays disappeared when I went to Campus Sakae. When I moved the mouse a bit, the settlement display reappeared.

Started a new Parthian campaign and the same thing happened. Played all right after the first turn, though.

Tried it on huge unit size, and the campaign crashed. Didn't crash to desktop, though, just locked up.