I've had something similar to this his happen a few times - most recently, I took over the control point, and was waiting on the inbound reinforcements, which said were in conflict. When I went to them, there was one guy, and he was just hiding in cover. I couldn't get him to move. I went back and waited, but to no avail. So, figuring I'd abandon the control point, I went on and found some allies fighting one of the tank/machine gun guys. As soon as I started helping them, I got the message the control point was clear, supply room unlocked, etc. I'd seen this happen before ("why the hell am I getting that message now?!") but didn't make the connection.
It's worth trying if nothing else.