Hi all, I've recently updated my iMac with a new SSD - and to start it fresh, I decided to do a clean install of El Capitan on here. I previously had Mavericks, together with iPhoto - but as I've just noticed, iPhoto has been fazed out, and I'm now equipped with Photos. I keep a Time Machine, and had a back up from just before I changed my SSD. Last night, I decided to go ahead and start migrating my photos over from my Time Machine, into the new Photos app. Everything seemed to go through very smoothly, apart from 8 albums. These 8 albums are displaying as grey boxes, with two other grey boxes inside them. If I quit the Photos app and scroll quickly down to where the grey boxes albums are, the correct thumbnail appears on the album cover, but then the 8 disappear and displays again the grey boxes (see image attached). All the photos are actually inside the albums, as far as I can tell - but inside the albums, they're showing up as just white squares. I've tried to rebuild the library, rotating the photos 90 degrees, etc, but can't seem to see what the issue could be? I've read that a few people with a massive photo library had the same issues, and it took a few hours just for the photos to appear, does any one else have any suggestion what the problem might be? Many thanks.