If you could also offer some guidance on how this should be configured to work with Plex it might be helpful. I'm not sure I'm setting it up correctly, so it's hard to tell if it's 'working' or not.

What I've done so far:

1. Configured the Harmony with the 'Plex' device 
2. Enabled multiple remote support in RB 
3. Pressed all keys on the Harmony Plex activity until all remotes are added into RB 
4. Created a new logical remote to correspond to each hardware remote ID. Named them the same as the remote ID for ease of reference.

At this stage I'm not sure what to do next. I assume I need to go to the Mapping page (where each of the new logical remotes now appears, with default mappings inherited from the existing remote). Do I change all of these back to their 'default' functions?

In my case, for example, to perform the function 'Play', Plex expects 'Remote 151 Menu'. With everything configured as above, hitting the Play key on the Harmony is now bringing up the Plex menu.

Any advice is much appreciated.

Thanks,

Tom