Fix it by rerunning the Fifo patch from the install as follows.....
ssh to your Pi and...
Important..(use next whichever version of mpd you are using as your player...I am using mpd-v20.)
sudo nano /var/www/players/mpd-v20/mpd.conf.template
add the following lines to the end of the file... (this is for the oled data and will not affect your selected audio output details)
audio_output {
type "fifo"
name "mpd_oled_FIFO"
path "/tmp/mpd_oled_fifo"
format "44100:16:2"
#buffer_time "500000"
}
Reboot...