Family Member treated as Client Ruler/Bablylonian Holiday bug?

I am playing as AS - I moved my King and Heir to Antioch soon after the start of the campaign. Almost immediately the faction heir lost all of his movement (Antiochus was outside fighting at the time). When the King (Antiochus) moved into the region he rapidly started to lose movement points. Getting fed up with 1mm movements I placed him in Antioch with the result that he lost all his movement points as well.
There is no traits whatsover that indicate any far less all movement should have been lost. I can only think that either:

1/Babylonian Holiday script is playing up or
2/They are being treated as client rulers by the script.

Ok, to make it weirder.. I had several family members (NOT syriakos family) move through Antioch and no problems, no movement lost etc.
About 6 years later another Family Member (syriakos family) in Susa lost all his movement points and is now stuck as well. Once more, no traits etc to indicate any problems, just no movement. The current King is still stuck in Antioch with 0% movement after Antiochus was killed there in a battle.

There has been no disasters on those tiles for the entire game, i.e. no earthquakes or floods etc.

Obviously this is making it extremely difficult to run my empire. I have just deleted Map.RWM and will see if it helps, but am not hopeful. Has anyone else experienced this, and if so how is it fixed?
Thanks in advance.

FYI - syriakos family is the ruling family at start of game, just to explain, so far it only seems to have affected that particular family though it could be a coincidence.

Deleting Map.RWM made no difference.

As a matter of interest the new family member stuck in Susa is the current faction heir. Perhaps it is only Ruler/Heir that get stuck by this bug, whatever it is?

I am an idiot, sorry, just noticed the other thread in the bug reports on the same issue - feel free to delete my thread:embarassed: