I searched the other postings, but there aren't any asnwers to this problem, other than just advice to go and fix leaks. Which isnt the cause of the problem.

I'm getting this error:

Processing areas...done (0)
Building Faces...error: material BRICK/BRICKFLOOR001A doesn't have a $bottommaterial
error: material BRICK/BRICKFLOOR001A doesn't have a $bottommaterial
done (0)

Here is what I know:

1) no leaks. no leak error, no pointfile. no leaks.
2) I've replaced the texture and this is the new error:

Processing areas...done (0)
Building Faces...error: material DEV/DEV_MEASUREWALL01C doesn't have a $bottommaterial
error: material DEV/DEV_MEASUREWALL01C doesn't have a $bottommaterial

Replacing the texture doesn't fix it, but it DOES let me know what objects are affected. There are quite a few brushes.

3) I am guessing that the original floor texture that i used as a default when I built these brushes, included properties that are not removed or altered when the new texture is applied, and that I have to either edit the VMF file or recreate the brushes.

Any advice would be welcome.

Thanks

BTW: The advice here on building one brush at a time... well, you can't say it enough times. I tried to be "efficient" and spent the past two days paying for it. Build each brush by itself and treat it with care. I don't carve, but clipping, rotating and flipping, lead to all sorts of wonderful little errors. -Thanks for the good advice here.