Media Player stopped playing video

Media Player stopped playing videos after enabling Composure Plugin (though I can’t say for sure that was it). Started spitting this out at me;

LogSlate: Took 0.000165 seconds to synchronously load lazily loaded font ‘…/…/…/Engine/Content/Slate/Fonts/Roboto-Light.ttf’ (167K)
LogAssetEditorSubsystem: Opening Asset editor for MediaPlayer /Game/Movies/NewMediaPlayer.NewMediaPlayer
LogMaterial: Display: Missing cached shader map for material Material_0, compiling.
LogShaderCompilers: Display: Worker (1/5): shaders left to compile 18
LogShaderCompilers: Display: Worker (2/5): shaders left to compile 13
LogShaderCompilers: Display: Worker (3/5): shaders left to compile 8
LogShaderCompilers: Display: Worker (4/5): shaders left to compile 3
LogContentBrowser: Verbose: The majority of assets in the view are of type: FileMediaSource
LogSlate: Window ‘NewMediaPlayer’ being destroyed
LogSlate: Window ‘NewMediaPlayer’ being destroyed