I suspect this is going to turn out to be a bug, but one that few will ever experience. You have to accept a ceasefire from a Roman faction and have your popularity fall in order for that faction to be able to repeatedly attack you *without* ever having a state of war develop--really odd to be under an active blockade and siege, but no war. I've noticed that they don't seem to be attacking my field armies...they might not be allowed to...hmmm...that could point to the source of the problem too. It might be that it is not being prevented from taking certain hostile actions that should not be permitted, so when it does them, it does not trip the "state of war" flag.
You might want to do a save right after you get it so that you can experiment in case you are offered a ceasefire. What seems to have happened is that while I artificially created the civil war, my popularity with the people was not high (very low.) So if I accept a ceasefire from any of the Roman factions, they are allowed to attack me but without declaring war, but I can't attack them. When I try to attack on land/sea or siege/blockade I get the box asking if I want to attack a "neutral faction" (one that is blockading my ports and sieging my cities at that very time), but the yes option is grayed out. The message says my popularity with the people is not sufficient to attack Rome.
I'm right now forming a *wall* around the Scipii with troops to keep them from escaping without a field battle (hoping it will create a state of war, don't really care if I win or lose the battle.) I eliminated the Julii and Senate after this problem first appeared. So now the Senate tab is gone, and I can't check on my popularity, but nothing else has changed. The Scipii have turned into a Geisha attempting to reach my cities. I was powerless to save Croton, but the presence of my large army there is resulting in them accumulating stationary stacks next to mine. And the stupid Carthies won't take Scipii's Messana containing 2 or 3 units, when the Carthies have a full stack on the border.
I tried accepting trade rights from them and later offering an alliance, but it didn't work. I cut off trade rights to reduce their income (we had lots of trade...but I don't really need theirs, while they seem to need mine.)
Granted, this came from modding, but the extent of the mod was rather small and focused.
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