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How Can I Troubleshoot Missing Photos Extensions?

Yesterday I installed and tested Skylum's new application "Luminar 2018", side by side with last year's version "Luminar". When I checked the Photos Extensions (in Photos as well as in System Preferences), only the old app was listed there.

I thought I perhaps needed to delete the old version to let the new version appear in the extensions list, but that did not work, and worse, after I reinstalled the older app, now both extensions are missing.

How can I fix missing Photos extensions?
Would it help to uninstall the app completely and to reinstall it from scratch?
Do Photos extensions "register" only on the first start of an application?
Are extensions registered in a kind of database only, and can the user rebuild that database somehow?
Or are the extensions copied to a place in a Library (e.g. Application Support)?

MacBook Pro (13-inch Mid 2012), macOS High Sierra (10.13), null

Posted on Nov 17, 2017 2:13 AM

Best reply

Kurt J. Meyer Author

Level 1

29 points

Posted on Nov 17, 2017 5:25 AM

I am still waiting for Skylum's individual answer.

Regarding your hint: Right-Click on a picture and selecting "Edit with …" did not show Luminar (2018); I was able to choose it then with "Other …". But this would be external editing (that produces new JPG pictures), not the desired plug-in way of editing that stores all modifications as database entries in Photos only.

Since I did not find Luminar in the popup menu there, I now did some system maintenance with OnyX (rebuilding the Launch database, dyld's Cache, the XPC Cache, and the Spotlight index.