Campaign mission 13 - Draw-bridge
I don't have much to go on this since I did not save the game.
After activating the two levers to lower the bridge, the bridge was in a lowered state, the sub-objective was accomplished and gone. However, none of my units could cross it. They were flailing away at it as if it was a solid barrier. At 750'000HP and always regenerating there was nothing I could do.
Only a few Occoluses and Bafus could get into the Emperor's throne room. 4~5 units at level 10 took forever to bring him down while my whole army was locked outisde and watching. After killing him I got the cutscene and 'my' 'victory'.
I destroyed the winches for the very last task in mission 13 and the drawbridge lowered. I can see into the chamber but my units won't cross the bridge as if it was never lowered. My flyers can cross and I can teleport across when I'm possessing a shadow or worker, but all the rest are left behind. It doesn't seem like the opposing units will chase me out of the chamber, either.
This was today, May 29, 2016 with the latest version (build 1151022) according to Steam. I saved restarted the game without luck. I have not retried the level.