Not to step on your toes Keith, but I'm not seing this if I disable the expansion. Also, this was in my log for the expansion (the MainThread.txt one):
numberOfReinforcements = (number of planets not controlled by the AI / 2) = 5
Whereas without the expansion enabled it looks like:
numberOfReinforcements = (number of planets not controlled by the AI / 2) = 0
numberOfReinforcements must be at least 1 and at most 15; = 1
I only control my home planet in both games (I started new ones and let them run for a few minutes)
Edit: looks like you found it ignore me