Lightroom Sync hangs with a couple of images until restart

Question

As a long time reader this is my first post in this community.

I am struggling with a strange behaviour in LR Classic (currently 12.0.1): I have synced roughly 10.000 pictures from LR Classic to the cloud. This is normally working well and after I have changed or added a couple of photos the cloud icon in the upper right corner is soon showing the green tick overlay again. Anyhow, when I leave LR Classic open on my Mac for a couple of hours without working in it (or in one of the mobile apps) eventually the cloud item will change to the blue overlay again and it shows that a number of pictures are currently waiting to be synced (the number is mostly something like 10+ pictures). Strangely enough this number never decreases and if I add pictures to a collection to be synced (or add a new collection to be synced) the number of pictures in the queue is increasing but these new pictures won't show up in the cloud.

When checking "Lightroom Sync" tab in preferences all pictures are listed with "Metadata" in the "Sync Details/Errors" column.

There is no single collections which would contain all pictures listed and quite a lot of them haven't been touched for a while.

Pausing sync for a while and then resuming doesn't help.

Only when I restart LR Classic the sync starts again and the queue is finished within short time giving me back the green tick on the cloud icon. Then all changes are synced immediately again until eventually a new unmotivated sync is starting (and hanging again).

Has anybody experienced the same behaviour, too, and would know how to solve this problem without the workaround of restarting Lightroom?

Any hints welcome. 🙂

Lightroom Classic 12.0.1 (but this problem did also appear in LR Classic 11)

MacOS 12.6.1

cstoba · Answer

Hi again

Just a short follow up on this issue. Also after I had unsynced all collection in LR Classic, removed all photos from synced photos and started to resync the collections one by one the problem with hanging sync eventually reappeared. Thinking further about nthe problem I was suspecting the photos being somehow changed in Lightroom Classic in background and thus being marked to be synced again without that I would have touched or even changed them. So I came accross the catalog setting "Metadata" -> "Autmatically detect faces in all photos" and tried to see what happens if I turn it off.

Well, looks like this made a difference. I have turned off this setting for about a week now and since then only once experienced a sync problem when I put a Photoshop PSB file in a synced collection (PSB files are not synced to cloud). So in fact this background face detection process seems not to play to well with Lightroom Sync ... at least not on my system.

I thought this might be of interest for anybody else experiencing the same problem.

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