Can't Play Media from Simple Sync (AKA Roomie Remote)

Hi guys,

I've been having a problem connecting from Simple Sync to Plex for a while now, and I'm pretty sure it's a Plex problem.

I've tracked it down to a problem with a REST call, can anyone shed any light on this please?

The REST address is http://192.168.0.5:49386/system/players/192.168.0.5/application/playMedia?key=/library/metadata/62671&path=http://192.168.0.5:32400/library/metadata/62671&machineIdentifier=42df734376da16c100549f17c07895640e0c748c

The address looks OK, although I'm no expert on the REST API, the response is below, I can replicate it in a REST client.

<?xml version='1.0' encoding='utf-8'?>

Traceback (most recent call last):
File "bundles-release/Framework.bundle-dist/Contents/Resources/Versions/2/Python/Framework/components/runtime.py", line 843, in handle_request
File "/Applications/Plex Media Server.app/Contents/Resources/Plug-ins-f38ac80/System.bundle/Contents/Code/playerservice.py", line 67, in process_legacy_remote_command
result = cmd(**kwargs)
File "bundles-release/Framework.bundle-dist/Contents/Resources/Versions/2/Python/Framework/code/sandbox.py", line 19, in _apply
File "bundles-release/Framework.bundle-dist/Contents/Resources/Versions/2/Python/Framework/api/playerkit.py", line 51, in __call__
File "bundles-release/Framework.bundle-dist/Contents/Resources/Versions/2/Python/Framework/api/playerkit.py", line 25, in _function_arg_str
TypeError: _format_args() got an unexpected keyword argument 'machineIdentifier'

I'd really appreciate any help you can give me.

Thanks, Siobhan.