EDIT: Please note this release has some desktop mode usability issues I am working on. Specifically the web client doesn't update after you play something.
Use the desktop mode? Have you ever seen this?
This release completely changes how the desktop mode's web client talks to the player backend. It now communicates directly over http locally and does not require two separate sessions which can lose sync with each other and cause issues. You can also easily and reliably switch between multiple servers in the desktop mode. Please note that casting from the desktop client to other players is currently disabled due to this being an early version of the new communication mechanism.
If you are using the desktop mode, you will need to log out and back in after upgrading if you want to control the client from another device.