Mission 8 HUD Disappears - Can't complete mission

On Mission 8: Cathedral of Kadesh after I destroy all the Inhibitors the HUD disappears to go to cinematic mode (with the black bars at top and bottom) then that’s it, I have no access to any menus - the only thing I can do is click on units and move them with right click.

After a while I am just forced to ALT-F4 and close the game as I can’t even access the game menus. This means I can’t complete the mission or progress. How do I fix this??

Any Idea how to get past this or am I ending my whole Homeworld Experience after 8 missions??