I've had a number of reports of couriers not being dispatched from various users of my mods, which typically have quests started by a letter arriving. One user tracked this to another mod (which he didn't name) that had essentially turned off all couriers by preempting the Change Location event with a node that failed to share the event.

I believe I'm having a similar issue with the Change Relationship Rank event. Most users have no issues, but some never see these getting to my scripts.

Short of having the PC users turn on the SM log, and examining the entrails, is there anything they can do to track down these conflicts?