Lightroom Desktop and Classic sync issues

[DIII]

Today I updated to the newest versions of CC (v.9.0) and Classic (v.15.0). The sync between CC & Classic is damaged.  Within 20 minutes of launch, the following were observed not to work properly even though both apps say they are fully synced (green check):

• A photo duplicated in CC syncs to Classic but shows a MUCH lower resolution.  It was cropped from portrait to landscape in CC, but the change isn't visible in Classic.  (Note: the lower resolution indicated in Classic is NOT the cropped resolution.)

• When "rejected" the above low-res duplicate photo disappeared from Classic.  It reappeared when unflagged back in CC.  It's still not cropped.

• Colour labels are only showing in CC for about 2% of the photos that are color lablelled in Classic.

• Collection re-name in Classic doesn't sync to CC Album name like it used to.

I have let each app run (separately) for a 15 minutes, but no change.   CC syncs fine too another computure running CC, but to Classic it is only partial.  Classic is certainly logged in and some things do sync.   This setup has not had sync issues of this nature in the past.

[DIII]

To be clear:   "Lightroom CC" refers to the newer cloud-based app now simply called "Lightroom" (for MacOS)

[Sameer K]

Hey, @Diii. Welcome to the Lightroom Community. I'll help you figure this out. 

Are you certain which images, or collections/albums, are impacted? 

Lightroom Classic does not directly sync to the Lightroom desktop; you'll have to check Lightroom Web (https://adobe.ly/4eF2E7u). 

In Lightroom Web (https://adobe.ly/4eF2E7u) and look for the Deleted Section and the Sync issues tab (if they exist). Emptying both of these has helped in the past. Before emptying these tabs, please ensure you have backups for the images.

After this change, let Lightroom sync and check if it returns to normal.

Thanks!

Sameer K

(Type '@' and type my name to mention me when you reply)