I have a document library with a custom folder content types - Project Folders.

The Project Folders have metadata associated with them - department, project
manager, etc. I want to create views that show particular departments just their
project folders, whatever other folders they might be buried under. But, when I
filter for Content type = "Project Folder", I don't get anything.

Any suggestions?

This is a slightly desperate situation as I thought it was easy and left it to
the last minute, right before user acceptance testing.