I have found that some family members that are quite far down the inheritance list have this in their names (18783927583275th in line to inherit)

Hmm this is a part of the mod I haven't touched since the original. It is possible a trigger has been changed in one of the updates. I will look into it, thanks

I can see what you're referring to, this seems to be caused by characters that are either in the player's family or immediate family of a ruler that are ineligible to inherit - giving them a very high number "in line". Long story short - I'll try to fix it but can't guarantee I can without completely removing the whole "in line" system.

the nth in line string is used in the notification window to reference your relatives (Marry your daughter, etc). Perhaps that logic was updated recently and SNAT is using something older.

Should be resolved.

Is there compatch for your mod and gui x mod ??