Just updated my RuneUI from git for the first time since installation.
The add, replace and play function no longer clears previously queued tracks and they are left at the top of the queue.
Editing post to say that this only happens when you select and Album. Selecting a track works fine it will do the replace.
If you select a Artist the queue is cleared but the Album/Tracks do not get added to the queue.
RaspberyPi 2 with hifiBerry DAC+
OS Linux Mint 17.1 64 bit
Browsers Firefox 38.0 and Chrome 43.0.2357.65
Same behaviour on other interfaces using Android client on Nexus 7.
Have rebooted numerous times but same problem & can reproduce it every time.
Fix at the moment is to clear queue manually before adding other tracks.