Alt + sound icon click not working

Hi, Merry Christmas and a Happy new year firstly!

I have been using airport express to stream ITunes music and all works fine (well most of the time)

Tried to stream Spotify yesterday for some christmas music (I dont own any on itunes) and everytime i Alt+sound icon clicked and selected Airport express, it basically just ignored it and defaulted to internal speakers, I googled this and tried the only thing i could find which was to activity monitor kill coreAudio but to no avail, still no music to my sound system.

any ideas??

Macbook Pro 2009 - Mavericks.