One A9 Sync ManageNOo SyncNo Sync

A

AC Question

My One A9 has stopped syncing using HTC Sync Manager.
When I plug In the USB, I get "Update Needed. This device needs to connect with the latest version of HTC Sync Manager. Please check for update or download."
I have checked both the phone and the PC software (HTC Sync Manager) and both report I have already installed the latest version.
This started a couple of weeks ago. Till then... all good.