I can't help with this, but I've also ran into a campaign stopping glitch.
I'm on Apocolypse, and my team conquered the four dread lord planets before I did, and the game won't end. Under victory conditions it says I'm 100% of the way to winning.
I culturally flipped three of the DL starting planets, and traded for the last one, but that didn't finish it. I even researched Technological victory, but that didn't work either.
Thankfully I've already done the DL campaign. Hopefully the DA one actually works.