Cannot open an external library
I copied the full Aperture Library to an externat disc (the original computer has gone for now). Yesterday I tried to open this library on my son's MBP (choosing "other library" from the external disc) and it opened perfect.
Today I got a new Macbook Air, tried to do the same , but so far it failed always: first reporting some errors, then "rebuilding" and being stuck. Now repairing and being stuck at 22%. I wonder why and why I simply cannot open an external library ("switch to Library") on the latest MB Air on the fresh installation
MacBook Pro with Retina display, OS X Mavericks (10.9)