One of my Dropbox folders appears on the website, but not locally.

[Stephen B.25]

v204.4.5420 on 6.10.2-arch1-1

On the website I can see a folder Dropbox/pepper, but on the  local disk of one of my desktops that directory is not there.  The directory is there on another desktop on the same LAN. 

All directories are selected in the synch panel of the admin dialog. 

Status is reported as "Up to date".

[Stephen B.25 · Accepted solution]

I hadn't noticed the date window for the 'deleted files' was so narrow. I broadened the date search and saw that I had deleted some directories without knowing I was doing that. 

Restoring those directories has done the job. 

Thank you all.