There appears to be some sort of problem in 4.15.1 where the music queue is not being displayed.
This is happening to me with my installation that was upgraded to 4.15.1. It is not happening in my developement test area.
I don't know what's going wrong, but I will look into it tomorrow.
If you installed 4.15.1, you can download version 4.15.0 and install that instead of version 4.15.1.
4.15.1 issues
Re: 4.15.1 issues
The issue with 4.15.1 would only show up if the mobile marquee or mobile remote control were enabled.
I have reverted some incorrect changes I made, and 4.15.2 is currently being tested.
I have reverted some incorrect changes I made, and 4.15.2 is currently being tested.