I never use a playbar myself. It is pretty easy to insert the slide number and the total number of slides on the slides by inserting the system variable cpInfoCurrentSlide and cpInfoSlideCount in a text container on the main master slide. Cannot double-check your issue at this moment. Which theme do you use?
I now could double-check and I still do see the popup showing the number of the current slide and the total number of slides. Have a look at this example, published to HTML5, where I did use a plabyar because of the subject:
Pausing Types