a Messages issue (old messages lost/incompatible); OS X Server problems (lost users); lost HiDPI options for extenal displays; a Safari download date bug (and alternative browsers); Aperture compatibility issues; Siri; a trick to finding macOS Sierra on the Mac App Store; Quicken Essentials incompatible; Apple Mail/Spotlight issues; a Preview print glitch; lost Photos (iCloud checkbox trap), command-line changes and more
