Problem migrating Squeezeplay client to new LMS server

I recently migrated my LMS server from a Windows 2008 Server platform to a Lubuntu machine (I'm running v7.9.1). All is working fine apart from a Squeezeplay client on my Windows 10 desktop. I used the LMS web GUI to move it from the old server to the new server, but whenever I stop and restart the Squeezeplay client it will not re-connect to the new LMS server. The new server also doesn't get shown on the list of servers if I try to use the Switch Library option.
The only way to reconnnect the Squeezeplay client is to restart the old LMS server (on the Windows 2008 machine), then move it to the new Lubuntu LMS server.

The exact steps I take are:
1. Open Squeezeplay - I get "Problem connecting" trying to connecting to the LMS Server (the old one, which is stopped)
2. Start old LMS server - Squeezeplay connects to it
3. Go to LMS web GUI for new LMS server and select Squeezeplay - choose option to switch it to this server
4. Squeezeplay connects to new server and all is fine until...
5. Close Squeezeplay
6. Stop old LMS server
7. Re-open Squeezeplay - once again I get "Problem connecting" trying to connecting to the LMS Server (the old one, which is stopped)
...then repeat from 2 above....

I've tried uninstalling and re-installing Squeezeplay but it didn't help. How can I get the Squeezeplay client to "stick" to the new LMS server?