Started recently, t=gives no error or any message
solved by restart, and recurred every few days.
WebDrive WebDrive 2017 (build 4804) 64 bit
Running on Windows 10, Build #14393.
Registration Code: 55-640N00-10F42475-000632-51E0
License Type: Individual License
Purchase Date: January 16, 2017
Have not found a solution, but it happens after a Windows update and/or a WebDrive update. If you go into the control panel, select services, then scroll down to Webdrive. You will notice it is set to Automatic, which should auto start it, but it is not running. You can just select start and it will work properly afterwards (until the next update).
I have gotten into the habit of just checking/starting it after each update. There is probably a way to test and start it from a script, but it doesn't happen often enough to force me down that path.