Any backups?
The files are still in the library. iPhoto library manager app shows all the files, albums, events,.etc. iPhoto just indicates it is incompatible and will not open. At a loss as how to proceed. There are no backups. The sad part is that I was shopping for ext drives on black Friday to move all the pics off the iMac. Just a little too late.
It just is very strange because it worked after install just not after machine restart.