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The only way you can get the error you are seeing is by the webserver returning the status "httplib.UNAUTHORIZED", which indicates failed authentication (ie. username/password).

Any ideas. I tried downloading the cfg file and putting the username and password fields in. I also tried putting a username and password in the webserver config in Kodi and the cfg file to no avail.

You mean you added "webserver.username" and "webserver.password" properties to your cfg file?

Just make sure the script is connecting to the correct port, the default port used by the script is 8080. You can configure the script to use a different port with webserver.port.

Perhaps you have something else listening on port 8080 (requiring authentication) while Kodi is listening on port 80. Just configure the script to use port 80.

Interesting. I changes the port and took out the username/password lines and hey presto. Can't see anything else on 8080 though on this machine. Weird, will have to do some digging.

Question is it downloading the missing artwork from one of the other clients or from the net?

Cheers
Spart