Aperture has been sunset, but the Apple Discussion group is still active. I’m encouraged by a discussion thread on Aperture 3.6 in Sierra. Brian O’Reilly in particular has done a great job testing an Aperture Library across multiple Macs (I think he’s a serious photographer, but who has 4 MacBook Pros lying around?) with good results. In his testing many of the El Capitan bugs have been fixed - leaving only the amusing bug of inverted thumbnails in list mode.
Other users are having the kind of problems I’d expect — hard crashes on full screen toggle, uncaught exceptions, etc. There are probably multiple issues, but some of them sound like video driver issues with older Macs. Apple often fixes these bugs 3-5 months after initial release.
I like to wait 6-8 months to do a major Mac update, so there’s lots of time for things to improve. When the time comes I’ll do some testing with an external drive before making the conversion. Still, this is better than I expected. I was pretty sure I’d stay on El Capitan through mid-2018 before switching to Photos.app then. (Surprisingly there’s still nothing in Photos.app I really want.)
I can’t figure out how to link to a specific post in Apple’s new Discussion forums (which I dislike, but they are getting better), but here’s the text from Brian’s summary post with some edits and emphases, followed by my response …
… [Known El Capitan bugs evaluated]
Thumbnails upside down in List view
Curves Adjustment and Straighten - not visible in export
Brush Adjustment - off by one pixel
Link to Plug-In menu not working
Keyboard shortcut ‘f’ (for fullscreen) causes crash
Keyboard shortcut ‘w’ (Inspector - Next Tab) causes crash
External Drive - Firewire 800
Clean install of MacOS 10.12 - customer release
Clean install of Aperture 3.6
Import of JPEG and Nikon Raw Images to a new Library - Images are Managed
The above Hard Disk was used a start-up drive on the following machines - with a Thunderbolt to Firewire adaptor as needed
MacPro 2012 - 64 Gb RAM
MacPro 2012 - 48 Gb RAM
MacPro 2010 -20 Gb RAM
MacPro 2010 -16 Gb RAM
Mac Mini Server Mid 2011 - 8Gb RAM
Mac Mini Late 2014 - 8 Gb RAM
MacBook Pro 17” Early 2011 - 16 Gb RAM
MacBook Pro 15” Early 2011 - 8 Gb RAM
MacBook Air Mid 2013 - 4 Gb RAM
MacBook Pro 15” Late 2014 - 8 Gb RAM
My test results are as follows - and were identical in all of the above tests
Thumbnails upside down in List view - Issue found
Curves Adjustment and Straighten - not visible in export - Issue not found
Brush Adjustment - off by one pixel - Issue not found
Link to Plug-In menu not working - Issue not found
Keyboard shortcut ‘f’ (for fullscreen) causes crash - Issue not found
Keyboard shortcut ‘w’ (Inspector - Next Tab) causes crash - Issue not found
… If machines after 2010 work better than before 2010 that would make me think of a video driver problem with Sierra. The good news is that those kinds of bugs are not app specific and they tend to get fixed in later versions of a major OS update.
If I had updated to Sierra and was having problems I’d try one or more of running Apple’s hardware test on my Mac, rebuilding the Aperture Library, rebuild JPEG previews and thumbnails, create a new empty Library, test that, them import the old Library into it, backup to a fresh Vault and then create a new Library from that Vault, run Aperture as a new user (so eliminate existing prefs), and perhaps try “Reprocess Original” to change to most current RAW processing.
Also, create an external (clean install) Sierra boot drive, install Aperture, and copy Library over to that for testing.
I don't plan to update to Sierra until spring 2017 at the earliest. If I do upgrade I'll do something like this:
1. Do multiple backups of Aperture.
2. Experiment first with a near-empty Library.
3. Be ready to try all the things listed above.