I can change the proficiency settings, but there are no real changes to enemy behavior. The Combine enemies simply do not stray from their standard HL2 accuracy. I have encountered no error warnings or any visible oddities in the console. I am using Hordemod and Stealth Mod (improved) in conjunction to this addon to spice things up, and, while doubtful of any conflict between mods, I feel as if I should list these in the case of any actual conflict between the invasion mod and the above mentioned mods.