Iphoto library is greyed out
I created a second iphoto folder on a separate portable hard drive and moved my holiday snaps into it to give me more space on my mac hard drive, but when trying to get some photos for my screen saver the iphoto library is greyed out and I can't select it. Is there a way to select it or change it from being greyed out?
MacBook, Mac OS X (10.5.8)