Error window says:

Microsoft Visual C++ Runtime Library

                         Runtime Error!

                         Program: ...ar empire rebellion\Sins of a Solar Empire Rebellion.exe

                         This application has requested the Runtime to terminate it in an unusual way.

                         Please contact the application's support team for more information. 

Happened while playing on a Random Huge-Multi map.  I was attacking a strong pirate base as a vasari rebel using my titan, a starbase, 6 capital ships, and a lot of frigates.  dont know how many.  i think i was about 3 and a half hours into the game.