One of my friends that just bought CC and installed mods to it is reporting in his "Skirmish Defense" games, the CPU is spawning custom units (from his multitude of mods installed, like UniTec and Darkstorm)

Since I have installed mods, I have noticed a second Skirmish Defense button at the bottom of the list of gametypes. The only difference I noticed was that there are no units being spawned, so I disregarded it. Has anyone else noticed this happening?

Another detail. I have the Cortex Command mod-manager installed, and he doesn't.

That would be CCMM causing that (with Enhanced Skirmish enabled). Since you're using B24, I would update CCMM to 2.1 (it is instead called "Custom Skirmish"). CCMM allows you to create a custom selection of enemies to fight in Custom Defense, such as only the Dummy faction.

Oh yeah, and Activities.ini will over ride the base skirmish activities.

okay, since I found out I was running 1.7 somehow (??) I DL'd 2.0 and it doesn't have an exe? I can't find any sort of executable program within the folder I dl'd. Is it suppoesed to be like that?

You probably downloaded the source (and really, if you're using B24, download 2.1).

Yeah, the 2.0 was accidental. I got everything fixed now, thanks.

The only problem now is too many units on screen at once, bogging down my framerate! lol