Exit or Close Button?

Hi guys, has anyone else been having issues with the Exit Course button not working in Rise? I've been creating a series of Rise courses and uploading them to our LMS. The first five I created work fine, but for anything I've exported in the last few days, the Exit Course button just does nothing when pressed, on PC and mobile. I haven't changed my Export settings or course structure at all.

Can anyone shed some light on this or had a similar experience? 

Thanks
Carolyn