For the few remaining diehards still using Aperture, I just thought I'd make you aware of an issue that I came across very recently. I am now experiencing this problem (I'm running Aperture 3.6 with OsX El Capitan 10.11.6)... https://discussions.apple.com/thread/7549320?start=0&tstart=0 I noticed that several of my newly edited images were displaying correctly in editing mode, but in thumbnails and all image exports the straightening / rotation was well off, as well as some smudging and artefacts becoming visible when using the undo tool in association with straighten and crop. It appears that this occurs with images that you straighten and apply either curves or levels to (bizarrely if you use "auto-enhance" first then tweak the edits, Aperture applies the correct straightening). Fortunately this only appears to effect new versions and edits, but don't quote me on that. My greatest worry is that corrupted, bugged edits might now start effecting my existing 7000+ images, resulting hours and hours of work just going down the drain. I think I'm just going to have to accept the fact that I can not trust Aperture with any images anymore (a sad day), and export my stuff into something else asap. I used to shoot RAW exclusively, but now shoot mainly jpg as Fuji's jpg's are so good they only need minor tweaks in post. I think my plan will be to move to Lightroom (no surprise there) but export my favourite jpg's from there into albums on Apples Photos (for synchronisation, AppleTV viewing and iCloud sharing purposes).