This bug was reported to Apple in February 2017. The only solution is to restart the affected Mac. Full details are here, and information about what has changed in 10.12.6 is here. The most obvious symptom is that scheduled backups stop, becoming very irregular. Macs which are left running continuously for more than about 7 days are liably to develop this. The long-running bug affecting undocumented systems in macOS which schedule and dispatch background activities, most notably including Time Machine backups, has still not been fixed in 10.12.6.
Time Machine and other background activities – irregular and unreliable after long periods of running There is no workaround: printing from Contacts remains partly broken. This was first noted here in 10.12.5, and is unchanged in 10.12.6.
Almost any control which you try to adjust after that will result in an unexpected quit: for example, editing the Attributes, or changing the Flip Style. With the uppermost popup menu reading Contacts (for the app-specific print settings), select the Style of Pocket Address Book. Open the Print dialog in Contacts, and Show Details. (Thanks to Richard Petersen for reporting this.)Ĭontacts – unexpected quit from Print dialog
The workaround is to disable display sleep if affected, and rely on a screensaver which darkens much or all of the display. This was new with 10.12.4, persisted in 10.12.5, and fixed only for some users in 10.12.6. So far the only way to restore a normal image on the internal display is to restart. Although the external displays wake normally, the iMac display does not. Note, though, that those are no longer maintained.ĭisplay sleep – multiple display setups may not wake properly after sleepĪ few users, mainly with iMac 5K models, are reporting that allowing display sleep with one or more external displays connected causes problems when waking. If you are looking for a list of bugs in previous versions of Sierra, that for 10.12.5 is here, for 10.12.4 is here, for 10.12.3 is here, for 10.12.2 is here, for 10.12.1 is here and for 10.12 is here. Note that bad features, poor interface design, and problems with third-party apps, etc., are listed separately here.
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