Music Sierra: spacebar no longer starts stops music

“I'm getting the same issue on Tahoe. Indeed, all shortcuts are greyed out.”

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Unlock your Music Library Folder:

Right-click on your Music Library folder, and make sure “Locked” is un-checked.

No Success?…

A Reinstall May Work:

Back Up, then Reinstall the macOS:

Nothing would be deleted. It's just that items that have become corrupted or deleted, would be replaced or reinstalled back to where they should be, respectively. Go Here: How to reinstall macOS from macOS Recovery - Apple Support

Important:

Create a Time Machine Backup, First:

Prior to the re-installation of your macOS, be certain to backup your Mac using a Time Machine Backup. That way, you can have something to restore your Mac from, should anything go wrong with the reinstall. Use an external hard drive that is at least 1.5 the total storage capacity.

“neither of these should be issues; they were not previous to Sierra. i hope they decide to implement a fix soon.”

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For Sierra:

Apple will not fix this for Sierra, as bug fixes are no longer make for it. There are exceptions for older macOS versions, however, such as the days of COVID, when apps would stall due to insufficient ISP availability). So, take this as a reason to upgrade to newer macOS. Not sure how you got Sierra on a 2023 M3 Mac, BTW. Even if you could, the Mac would lag.

“I'm getting the same issue on Tahoe. Indeed, all shortcuts are greyed out.”

———-

So, what happens when you Unlock your Music Library Folder:

Right-click on your Music Library folder, and make sure “Locked” is un-checked.

I'm getting the same issue on Tahoe. Indeed, all shortcuts are greyed out.