Definitely a little too aggressive yes, but the Romulans seems to be Colony mad.
Sometimes they do, sometimes they sit there for 4-5 turns, move a sector or two and come back.The AI should not camp on systems being terraformed. Are you sure they don't leave?
Was on unclaimed sectors.Hmm? Unless such system was inside another civ's territory, the game never worked like that.
Its just a bit odd, you can't Colonise a system if its being terraformed even though whole planets are available, but the second that stops, its pretty much game over.This issue is partly due to the way it is coded. I've had it in the back of my mind for a long time to add a "partial claim" to terraforming.
I've also noticed most if not all M Class planets are inhospitable and need to be terraformed. Surely M class should be straight up ready to colonise?
With the latest update, enemies attacking OPs cause the game to not do anything. See screenshots. The game is still responsive, can select units and scroll in the engagement window, but have to Alt+F4 or right click the game and exit to get the exit dialogue. No errors generated. Clicking Engage or Hail leads to the same thing, no battle.