Play back

 Sorry for repeating this I couldn't find the edit botton. Hi all, I'm working with Audition CC 2018 on windows 10. My mix is not coming back in stereo and this is a first. Every place I look says it is a stereo mix but it's not, HELP! I have been using Audition for over 10 years. I should add that when I go to the session and solo one track, say guitar, when I pan right it plays from both speakers, when I pan left it plays back in one speaker with hardly any volume.