Please confirm your version of OS X. Click the Apple icon in the upper left corner, then About This Mac. Underneath the large OS X, what is the version?
Also, please reconfirm your version of calibre. When calibre starts, what is the calibre version shown in the lower left?
Please confirm your version of OS X. Click the Apple icon in the upper left corner, then About This Mac. Underneath the large OS X, what is the version?
Also, please reconfirm your version of calibre. When calibre starts, what is the calibre version shown in the lower left?