There's a merchant in a mod (Arnon Filanon, Shezrie's Towns) who's merchant service package isn't activating properly.

Whenever I enter the shop he enters a Cloned Form "Follow Player" package and won't ever offer his services. I've poked around in the CS, but I can't figure out why other merchants in the mod work fine but he doesn't. I did notice that he didn't have ownership of his shop's cell, so I fixed that, but it still isn't working right.

Any ideas on what could be the problem?

He probably thinks you're tresspassing. That is the default dynamic AI package assigned to a merchant in that situation.

Yeah, I could not for the life of me figure out why he was doing that.

...so I just completely rebuilt his AI routines. And he works now!