Hi all, I'm really hoping someone can help!  When I opened Lightroom a little while ago, my photos from the past several years (including current client galleries I am editing) are gone.  I tried to access my catalog by using the most recent backup on my desktop (I deleted prior versions to save space), and I received this message: I am now trying to open my Lightroom catalog by using a backup from my external hard drive.  When I attempt this, however, I receive the following message: I have tried to alter the permissions for the various files (to "everyone" has permission to read and write), to no avail.  Can anyone help? ... View more