Totaly broken Roman diplomacy in RTW 1.5?

I was doing some tests with my current campaign (just clicking End turn to see what happens)... I played Brutii, in the middle of the Civil war. Julii ofered ceasefire, and I accepted it (under heavy conditions - I gave them a lot of money and 3 provinces). A few turns after Julii attacked, which wasn't surprising.

What surprised me was the fact that Julii were still shown as NEUTRAL! And when I attacked them, I got warning message that I'm about to attack neutral faction. I checked diplomacy screen, and there was no war between me and Julii.

So, basicaly, we were not in the war, but they still kept attacking me.

P.S. I have an image but don't know how to include it.

Yes, this is a known bug. Never accept a ceasefire with a Roman faction after the civil war begins or you will be subject to attack by them but unable to attack them back.

Was it broken in previous versions?

It wasn't in 1.0 or 1.2; I'm not sure about 1.3.