Since Photoshop 2014 I have been encountering major problems when round tripping to photoshop. Simple edits such as liquify or high pass are fine. However when I start to do composites, increasing white space or anything sorta major things I immediately get a unsupported image format in Aperture. If I locate the referenced file it reopens in Photoshop fine and previews in the finder just fine.
Past attempts to repair/rebuild/permissions have been hit or miss to fix it. Deleting from the library and re-importing have been hit or miss.