I don't get it...

Terrorble

I have a NPC I want to walk up to a PC, say something, laugh, take something, then walk away.

I am using x2_def_userdef to run the code in the End Combat Round Event section for the actions I want them to take.

After many hours of no success, I put all the actions in assign commands and the NPC did exactly what I wanted.

I thought AssignCommand was only needed if a script running on something external to the NPC needed to have the NPC do something. Since x2_def_userdef is called from the NPC's own OnUserDefined script handle I figured just putting Action commands in there directly would work.

Obviously I am wrong, but I don't get why.

FreshLemonBun

Print out OBJECT_SELF and it's tag or name, that's usually a good way to find who owns the script.

Ancarion

I'm glad it worked out for you. Unfortunately, I think there's too little information in your post to really be able to give you an idea of what might have happened to cause your initial method to fail.