The file names have disappeared from my browser in Aperture 3. I have my library on an external drive and when I load it on my iMac the file names are missing. There is a bar across the bottom of the previews and a small icon but no file numbers. If I switch to list view the files names are there. I have tried using “u” to reveal them but all that does is hide the bar across the bottom.

I have also opened the same library in my MacBook Pro and when I do that the file names are OK so I'm pretty sure it is a setting in my iMac that is causing this but I can't find any difference in the Aperture settings between the iMac and the MacBook.