I-photo won't work
I have an older macbook (2.26GHz core 2 Duo) and I recently upgraded the OS to Lion and purchased I-photo 2011. When I try to open I-photo I get this message: Your photo library is either in use by another application or has become unreadable. My only option is to close down. I have shut down and re-started several times, no help. I have my photos backed up, so am not concerned about losing them, just can't get I-photo to work. Any ideas?
MacBook (13-inch Late 2009), Mac OS X (10.7.4)