I'm running 5.0.1.2412
Right-clicking on a track in the mini-player brings up the normal context menu choices, but most of them don't work.
1. Populate a Now playing list
2. Switch to Mini-player
3. Right-click and attempt to remove a track.
Nothing happens.
The one error message I was able to see was if I selected "Edit Tags -> Case Checker"
This throws a Windows Application error warning on the screen "Cannot read property whenLoaded of undefined"