Synchronization problem - lock file remains on completion

[Barry Jackson <zen25000 zen co uk>]

I have just started to use synchronization to a local folder which is an 
sshfs mount (using keys) of a folder on my server which is on the LAN.

Initial sync (upload to server) went OK and quickly.

However when running sync manually from the menu to test it, the process 
takes maybe 10 minutes before closing (1500 notes). During this time one 
core of the local machine is at 100%.

After it completes the lock file is still present on the server and a 
further sync fails until it is manually removed.

This is gnote-3.24.0 running under Mageia 6 RC.

Any ideas?