EngageTimeline Next slide button not working

Hi all,

Hopefully somone can help!!! I have imported an Engage timeline interaction into my Storyline project and published. When you have viewed all the events a button appears "Next Storyline slide".....but this doesn't do anything? Previously when using ppt and articulate this button would move the user onto the next slide/ Engage interaction, but this is the 1st time i have tried it in storyline and it seems not to be linked to the next slide/previous

I know i have missed something in the properties or player feature but cannot figure out what!?!??

Pleeeeeeeaaase help

thanks