Yet another wall clean up issue

[Paul King]

I have inherited an ArchiCAD 26 model in which composite walls will just not clean up based on materials priority.  I am sure I am missing something obvious, but cannot seem to put my finger on it.

Per the screenshot below, a timber stud wall simply passes over a wall containing concrete without the materials interacting in any way, even though the wall reference lines touch. 

The concrete material has a higher materials priority than the intersecting timber material, while the plaster board linings for each composite wall all have the same priority - so based on that I would expect the stud wall timber to be cut short by the concrete material , and the plaster board to heal either side - but that is not what happens.

The walls are all on the same story, and have the same 'new' renovation status.  

Under Project Preferences/Legacy, walls clean up is not set to 'Legacy' mode (I tried it, and it does not help)

What am I missing here?

I have attached a module containing the walls, in case that helps.

[Lingwisyer · Accepted solution]

Same Layer Group?

[Barry Kelly · Accepted solution]

Walls in different layers with different (or zero) intersection group numbers?

Barry.

[Paul King]

Bingo!  Yes, the layer combo for the view had wrong intersection priorities set (freelancing for new office & with unfamiliar setup - suspect their template has been in use for quite a while and may even predate materials priorities being introduced into ArchiCAD).

Thanks guys!