We have somehow managed to make all the files in one folder in our PDM (2012) invisible.
The folder contains various admin file (blocks, templates, property files, etc).
We can see the folder itself, and the sub folders, but they look empty.
They are not empty, if you get the properties for a folder, you can see the count of files in it is correct. If you run the Print Files task, the files will actually print. They are there: we just can't seem them in the normal view.
This affects all users, even the admin user, who has all permissions checked. Everyone else appears to have the correct permissions.