Thanks Tim,
The tasks not completing are an OSOD issue which I'm sure @Lifetap will get to the bottom of eventually.

With regards the empty composition, that occurs generally when there's been a lot of fighting in an area and lots of reinforcements have been called by the AI. The unit gets pulled in to the fight, leaving their composition empty or with just the static weapons in. Just the way OSOD is and certainly something those learning to use OSOD need to be aware of for mission making. In this instance, there's not a whole lot I can do as the mission is so large and varied that I can't necessary replicate it in any testing and try to stop it.