Sent a fleet to attack a Kaltor and got this:
Heres the screen from the crash (so you can see the orders)
I cant suppy a save but have copied the crash dump:
Distant Worlds - Crash Dump - 1.7.0.16
15:15:32 06 December 2012
System.NullReferenceException: Object reference not set to an instance of an object.
at DistantWorlds.Main.hUANqLHLgdOcRUrVVNi(Object , DateTime , Int64 , Boolean )
at DistantWorlds.Main.CPPG6co9Dx(DateTime , Int64 , BuiltObjectList , Boolean )
at DistantWorlds.Main.ProgramLoop()
--- COMPLETE ---
Darkspire