Weird issue with thumbnails on Sketchup files

[keithswd]

I have a library of sketchup component files which I keep stored in Dropbox for access to our team. They are mostly models of garden plants, and are split into subfolders (Herbaceous, Shrubs, Trees, etc).  Just recently, I noticed all the thumbnails of files in the Shrubs folder had gone and only the Sketchup logo was displayed. Bizarrely, other folders not affected, so I thought that ruled out Dropbox as the culprit.  To troubleshoot, I tried

• copying all the files to new folder. No good.
• As the folder had 1200 items, splitting it between two folders.
• rebuilding icon cache
• plenty of reboots
• re-installed Sketchup
• Quit Dropbox

Nothing worked.

Eventually, I tried moving the folder to my Desktop, out of Dropbox. Thumbnails all reappeared instantly. So I copied it back to Dropbox. They all disappeared again!!

I am completely dumbfounded. Any suggestions welcome.

[Jay]

Hi @keithswd, thanks for posting on the Community!

Are you currently using Smart Sync in your Dropbox folder?

Are these files online-only, or local according to those settings?

This will help me to assist further!

[keithswd]

Hi Jay,

thank you for your interest. 

yes I do use SmartSync, and this set of folders/files are all set to Local. 

thx 

[Jay]

Thanks for the info, I'd recommend contacting the support team directly to investigate this further.

[keithswd]

thank you for your reply.

I was just about to contact support as you suggested, when after several days of no thumbnails, they miraculously reappeared. I had not done anything further since my first post here, so no idea what caused the 'recovery'.

Hoping it lasts...