Media Player App no longer has sound

I am having the exact same issue. For me, any media files that were encoded in Handbrake using the Roku device template have white noise and clicking in Roku Media Player after the version 10 update. Downgrading the Roku device is the only way I have found to resolve this, but it just auto-updated to v10 again yesterday and the issue is back, and rolling back to v9 isn't available anymore. I reported this to Roku support several weeks ago when version 10 was initially released, and I have to say that the "support" I received was among the worst I have ever experienced.