There has been an update to the beta branch that includes a lot of behind-the-scenes updates. I'll post full notes at a later time, but here are a few notes:
Music Player Related
Fix issue with music player not looping properly in some scenarios
Added Ability to Change Shuffle and Repeat on the Mini Music Player
General Improvements
Many fixes around videos that were clipped from larger files, which could cause various issues depending on some factors
Stall Guards to help if a tile gets locked up due to various reasons (IE clapping the GPU with multiple 4K files at once, with transitions, and a "lightweight" game running in the background)
And more that I'll go into detail later once out of beta
To use the beta enter access code “betabetabeta”. (right-click on the app in Steam > Properties > Game Versions & Betas)