So I've come back to CC after a few months to find that the mod manager has mucked stuff up and I'd need to reinstall.
I don't really mind this, so I've reinstalled, moved mods etc. etc. and now everything's working pretty much the same as it was, except for the AI in skirmish.
I can't get it to use any custom activities.

I've already tried commenting out skirmish activities.ini in the missions.rte/index.ini, (I had a look around in this forum for similar problems) but that leads to a "memory cannot be read" error as soon as I select a difficulty.

Currently I'm thinking that I'm either doing something completely wrong, or that CC is having issues with the activities.ini it's trying to load.
(I think this would be the Pelian Army one, as it's the only addon with an activities.ini which I haven't commented out.)

Any help would be much appreciated.

Nobody?

Once you disable the vanilla activities, you also need to enable the modded activities.

Just realised I forgot to re-enable the skirmish in the pelian index, which explains the problem. Derp.

Thanks for the response.