I too am having this exact same issue since upgrading to Mezzmo 5. I too have Windows Home server 2011 and the first thing I noticed is that many of the original files that were view-able in version 4 are simply missing in 5 when accessing via the Samsung Bluray player. But when I go into the server I can see them in the folders and also in the folders via the Mezzmo app. I will downgrade back to 4 to confirm it was the upgrade and then back to 5 and collect screenshots and logs.
Pat
Jack of all trades, Master of none!
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