EXS 24 Logic Sampler Users Group

This is my first post here so hello everyone

When selecting a sample for an EXS zone the browser has a 'play' 
button but I can't hear anything - the 'play' button actually toggles
between 
'play' and 'stop' but no preview 

Hope that explains the problem clearly

Any help would be very much appreciated

(Even though as I have been living with this problem for ages and in
a strange way it sort of encourages me to try out sounds I probably 
would not use so much otherwise!)