Using Chrome inspect took, I isolated the problem which was the header text box was set to not display for mobile media queries in the ‘responsive.css’ file.
I fixed it with this code:
However, you will need to ensure this is the same code used in your theme as this was the Greenest theme. Grace Theme developers do a good job but there is incoonsistency between themes as I have used several. But a bit of research should point you to the problem.