Walls in a merged file do not display properly

[ElProject]

Hello, 

I have a problem where I have linked a few files to my project (MEP systems), one of which being the architectural model of the project and some of the walls are not displayed in worksheets.

When you select the linked model the walls are shown, but after you deselect it they disappear from the viewpoint.

I have tried multiple display cut planes to no avail... I have tried searching different forums for other solutions but I cannot find a solution. Do I have to merge the files for the walls to properly display? 

Imported models were created in Revit.

AC25 here.

I added screenshots to see the problem.

[Lingwisyer]

Are they showing in 3D?

See links in my signature regarding creating a thread and adding a signature to your profile.

[ElProject]

Yes, they are showing in 3D.

[ElProject]

I am sorry, 

I opened the project today and somehow all the walls are displaying properly.

I dont know if it was something I did to the settings or not, but everything is fine.

So just try restarting the PC. Hope this helps anyone.

[ElProject · Accepted solution]

I eventually found that the problem was a layer from the imported topography model thats wa masking the walls.