pictures disappearing
I have down loaded pictures both from an SD-card and directly from camera.
Pictues were all in my iPhoto library for some time and I could work with them without problems. All of a sudden, they still appear, however, when clicking on a picture a black surface with a grey triangle and an exclamation mark appears.
I have reloaded the pictures which fortunately I had not deleted from the camera and they seem to be fine. Same thing has happened quite some time ago on older programs. Why is this happening and what can I do to prevent this?
I work with iPhoto '11, version 9,2,3 on a MacBookPro.
Thanks for any help.
MacBook Pro, Mac OS X (10.6.6)