Thumbnails display briefly, then disappear.
...Also full size images are replaced by gray triangle symbol.
iPhoto version is 9.6.1
Thumbnails show as I scroll, but disappear within a second or so. I'm left with:
Double-clicking on the blank thumbnail results in:
I have two iPhoto libraries; one on AirDisk and one local. Both have same problem.
All this seems to have begun after reinstalling Yosemite, which was apparently a very bad idea in this case.
Edit: Also, I've run all the iPhoto repair options. They reported success on repair, but problem persists.
Can anyone suggest a way out of this?
Many thanks,
Jerry
MacBook Pro, OS X Yosemite (10.10.2), null