P: LrC 12.2.1 fails to start/launch or is extremely slow launching.

After doing the fix suggested here to fix the LRC problem my program has run faster and better. That being said, I think I'll wait alittle bit to install the LRC 12.3. A little nervous it may not work and I'll be back to having a problem I don't want. 

I would be happy to share yet can not find the metrics.json

Today's 12.3 update did not resolve my problem, but after the following steps I'm back in action.

I started by renaming the folder containing my catalog and associated files. LrC was able to complete launching and generated new copies of the catalog files. I then put back my originals and LrC once again stalled at launch. I removed my Previews.lrdata file but left my original catalog file and this time LrC successfully launched. I then replaced my newly generated Previews.lrdata file with my original Previews.lrdata file and now all seems good. Probably that last step was unnecesary but I wanted to know if that file was the culprit.

Not sure what's going on here as I would've expected the original Previews.lrdata file to have become corrupted, but that doesn't appear to be the case. Perhaps the regeneration of the previews file reset pointers that had become corrupt? ¯\_(ツ)_/¯ 

Has the issue with the "metrics.json" file been rectified with the LrC 12.3 update?

NiklasHH

note/ originally NiklasHH did in fact post a separate problem, that got merged into the above/

As the bug that your posting got merged into, appears to not be the solution, and as you stated using another computer user account works, a more complete discussion of possible solutions as follows. If you have not already attempted to reset the preference file, that might be a good first attempt.

Account/user rights issue indicated by logging on as other user

See:

(ref 1): Troubleshoot unexpected behavior in specific user account | Adobe

Document referenced above includes for MACOS possible solutions:

• Grant read-write permissions on appropriate folders.
• Re-create the Adobe application's account-specific preferences files.
• Troubleshoot account-specific fonts.
• Delete account-specific Adobe cache files.
• Troubleshoot account-specific login items.
• Reset the access settings on the user account's Library folder.
• Repair the startup disk.
• Use a new user account.

and, perhaps:

(ref 2): Basic troubleshooting steps to fix issues in Lightroom Classic | Adobe

Document referenced above includes:

• Reset the preference file
• Install latest LrC version
• Install OS updates
• Troubleshoot user account permissions
• Setup a new Admin user account
• Start in Safe Mode to troubleshoot

Note, for additional information on resetting the preferences file, see (ref 3)

(ref 3): https://www.lightroomqueen.com/how-do-i-reset-lightrooms-preferences/

@NiklasHH  It sounds like your issue is unrelated to this thread. You should start a new issue under Discussions. 

Thanks.

@Johan Thalin  It sounds like this thread does not related to your issue. You should start a new thread in Discussions. - Thanks

This supposed fix did not fix squat. Still the same issue... I would appreciate if someone from Adobe support could have a look at this on my end instead of just merging it into other seemingly similar issues!

This is primarily a user-to-sure support forum. If you want help outside it:

https://www.adobe.com/about-adobe/contact.html

This supposed fix did not fix squat. Still the same issue... I would appreciate if someone from Adobe support could have a look at this on my end instead of just merging it into other seemingly similar issues!

@idahochukar  No additional steps are necessary. If you renamed metrics.json to metrics.old,  you can discard your .old file.