Just to second Victor's report.
1. I also had trouble with my squad freezing in position and failing to respond to commands.
2. After completing the primary objective the mission went to the cutscene and then to the debriefing. However, on the score sheet the "conquer the region" objective was unchecked and clicking continue dumped me back to the mission selection screen.
I reloaded the last autosave and the sequence repeated. This time, despite the fact that the primary mission was listed as incomplete, I was able to proceed to the next mission.