Try placing some Room Separation Lines, and see if they will enclose a Room. Try them by themselves first, then place them under some walls.
Also, check if there are any Phasing Settings or Design Options in any of the models which could be causing problems.

Are the Rooms parts of Groups? Have the Groups been edited or deleted?

Other than that, you seem to have checked all the other usual potential problems, esp. that "room bounding" is checked for the walls and the Linked Shell model, and that the Room Height Offsets are correct.

Can you post (perhaps even a small portion) of the file so we can take a look?

cheers

Have you placed multiple levels in between your floor levels? This might create such a problem

I would love to post a small portion of the file, but it's too large. If I take a piece and paste it into a new file, the room objects work just fine :-/

I tried auditing the file to see if that would help. Now if I try to create four new walls or four room separation lines and then create a new room object, I get a message saying that "a serious error has occurred; would you like to continue". If I continue, no room object is placed at all.

Also, no rooms are in groups. The project is new construction, so there aren't any oddball phasing problems.

Do you have a lot of Redundant Rooms in the Room Schedule? If so, try deleting all of them.

just a thought......

cheers

Recheck for additional levels like Martijn suggested, and also check the Room Computation settings... (Type properties for the levels)

Thank you, everyone for the suggestions! Unfortunately, nothing has fixed the problem

I did a little more detective work, by opening various back-ups of the file to see when things went awry (I am sporadically working on the project and haven't been in the file for awhile, so I didn't know when this first happened). None of the properties for levels, rooms, etc. had changed between any of the back-up versions, and everything looked fine.

It turns out that the file was renamed a week or two ago. The first save of the newly named file has broken rooms, while the last save of the old filename has rooms that work. I'm not sure how renaming a file could make the room objects break, but it seems like that somehow triggered the problem. The newly named file is properly set up as a central file, and all of the links are looking at the correct locations, etc.

In any case, from looking at the back-ups, it seems like the changes will be easy to redo or copy/paste from the broken file, so I might just rebuild unless anyone else has a potential solution.

Thanks again!

Very odd... I´d send Autodesk a support request if I where you (Link is at the top of the forum)

I'm guessing that there has been a fatal error with Save As-option. This might be related to the room problem. Is it perhaps possible to link the file in a new project, and then bind it? This should fix your problem since copy/paste also works.

Thanks Klaus,

This solved my problem. I had a linked file whose levels were 36mm higher than the host file (Site on a slight slope, so the buildings on the linked file were higher). Everything was scheduling and reporting OK in the host file until the client raised one of the floors by 75mm and suddenly that level on the host file was throwing up lots of redundant rooms.

Drawing Room Separation lines to identify the issue wasn't working. Room Separation lines in 3D were appearing lower than those on linked file.

Changes the computational height by 36mm and all OK now.

Damian