Glossary and play/pause button does not display in player in preview or published output

Hi Articulate Folks,

I have a perplexing situation where the glossary button in the player does not display in preview or published output. I opened and checked another course build and that works fine as expected. It's isolated to this content / build so I'm sure it is a setting / option I have missed somewhere. However, for the glossary function it is just a check box to enable/disable, isn't it??? I'm stumped.

The glossary is populated in the player, enabled in the side bar and visible in the preview display next to the settings (see images attached).

A side note - the Player Control - "Play / Pause" (without seekbar) does not display either when enabled in player settings. The play pause button and scrolling bar is present when the seekbar is turned on for the slide. 

Would appreciate any point in a the right direction

Simon.

Articulate 360 Build v3.75.30.269.0 (yes, I know its not the latest version. My IT Crowd have had a gutful of SL updates and told me to go away unless it breaks)