I know this is the Alpha, (version 13.2)
but according to the news, you are close to Beta....
Now I have a game that under 13.2 is unplayable due to the freeze the disables the game at the start of the troop/hunter mission - every single time I might add. So basically it is unplayable. If I proceed with the save game and restart option I can get thru that mission, but it rears its ugly head again a little later.
Another or related bug is the fighter display. - during the mission save and restore option to avoid the hunter bug - later on the fighter missions turned into a multiple fighters even though I only sent 1 fighter. during this air fight the computer eventually freezes.
The only time I experience the fighter issue is after I try to save and move on from the land missions with the "hunter" bug.
I have downloaded the game twice, switched from nvidia beta drivers to the last WHQL drivers - running windows 7, 64 bit with 8 gigs 1600 ram.