OS X used to provide a keychain first aid feature. Now this has gone, this is the only way that you can try to repair a defective keychain: create a new one.
macOS
Apple has today pushed out an update to its Gatekeeper Configuration Data, for Sierra and El Capitan users. […]
Sierra brings undocumented weirdness to the Finder, with a folder that is, but it isn’t, and improved Finder aliases, which don’t work as well. Yet.
A significant vulnerability has been found in El Capitan and Sierra’s security protection. Will Apple fix it shortly in 10.12.2?
If there’s one update that we need, it is an App Store app which works reliably. The current one suffers from general dystopia.
There were 2 serious incompatibilities when Sierra launched: ScanSnap which is now fixed, and Dropbox. How’s Dropbox doing now, then?
Not back to the Bluetooth purgatory of El Capitan, but still some worrying moments when your trackpad goes missing.
Time to pause for breath, I think, for macOS and Xcode. Apple needs to bring the docs up to date, and attend to the detail.
Some users are having problems getting Time Machine to work in Sierra. Here are some suggestions to get that first backup completed.
An extensive listing of books, courses, example code libraries, coding environments, and more to help you get going in Swift 3.
The Eclectic Light Company 