You should hear the show when the page is done loading. If you don't hear it, press the Play "triangle" on the player under the PulpMX Show banner (just above the chatroom). If it's still not playing, make sure your Flash plug-in is up to date.
As a last resort, use the contact form in the main navigation and we'll do our best to help you figure out why.
The easiest way to listen, other than this page, is the Tune-In Radio app which is available for iOS and Android. Simply launch the app and click the "browse" tab, then search "pulpmx".
Tap the search result and the live stream will begin playing.