Theme Causing Admin Bar to Disappear

admin bar.gif
Hello,
My Admin Bar disappears with themes active.
I've narrowed down the issue a bit further but i'm not sure how to fix it as of yet.
Still learning dev 101...

Symptom:
When I have Thrive Theme active the Admin Bar on site disappeared.. This issue manifested after I saved from the customizer menu.

When I switch to 2017 theme the bar is active again.

Is this a Css? or Php problem?

Bryan