Lightroom Desktop 2.4: Sync Issue

Hi Simon, I had exactly the same issue and none of the "solutions" here worked. Have you organized all your pics/vids in Albums? if not, do so - there will be this little blue, spinning wheel at the album that contains the picture/video that does not sync. If you have identified that Album (if you have a hierarchy of folders and Albums you need to open all folders until you see it or create a (few) new top level Albums.) then move copy the content to an other fresh Album - in small groups or picture for picture. At the moment you copy the malicious one - you will have the blue spinner at both Albums. Then you have identified the problematic file. What I did: I downloaded it. Deleted the file in the Cloud and uploaded it again. Then it worked. In my case a video file caused the problem.

That sounds like a brilliant suggestion. I get how that could work. Pick half the photos and put them in an album and see if it syncs. Then the other half...and keep breaking it into half each time until you find the offending item. I've not got off to a good start....created two albums and they're both stuck syncing.

Do you see a Sync Issues collection top left when you view in Lightroom for Web?

Hi Rikk. No that's not there

If you click on the Filter icon next to the search bar in Lightroom Desktop and then click on Sync Status, can you isolate which image(s) are affected?

No. I saw that in one of your other posts and tried that. It doesn't find anything.

Grab a fresh Diagnostic log and send it to me at:
 

I've sent it.

I've had similar problems for the last 5 days. Windows 10, Lightroom 2.4. All mobile devices AND Lighroom classic syncs perfectly but the Lightroom CC on the sam stationary as my Lightroom classic started acting up all of a sudden. Nothing helped, reset settings, reinstalled Lightroom CC, checked firewall settings. Deleted sync.lrdata etc etc. It wasn't until I created another album online and started to move around the files to that album that Lightroom CC finally woke up and started to acknowledge and actually sync the rest of the files that wasn't showing up. Also, once that started working, it finally synced my preset structure to the my mobile units. This was unnerving and I'm not sure I can trust Lightroom CC sync reliability now. I took the liberty of sending you my diagnostics logs too which includes the last couple of hours/days struggle to get Lightroom CC to sync.