Its as simple as that I'd already used planetary invasion previously but for what ever reason when I attempted in Drengi homeworld I got a heavy freeze then I had to go back to desk top as Galciv became a plain white screen that I could not even tab into, though the music was still running in the back ground, I have a feeling its still memory based and I will be able to put that to the test at the weekend as I am picked up another 8gb of ram to go up to twelve which I had planned to do regardless of GalCiv anyway this just forced my hand a little bit quicker. If needed I can dig out the data files for the crash.
Thanks crimsonsun