I am not a pro on this but looking at the mediabrowser.log last two lines it looks like you might have had the problem I had.
You need to ensure that you you add in 'Path Substitution' in the Library > Path Substitution page of the MB Server.
This is because its looking for the local m:\.... filepath on the server when trying to play the file (which is why the server works) but that won't work on the client.
You need to ensure that you you add in 'Path Substitution' in the Library > Path Substitution page of the MB Server.
This is because its looking for the local m:\.... filepath on the server when trying to play the file (which is why the server works) but that won't work on the client.