Blank resume dialog box

The "resume course" dialog box in my course has been showing up blank for the most part. The text that asks the user to resume the course is missing/blank. The "Yes" and "No" buttons show up and function properly. 

I have made sure the text is not white in the Player settings (notification window colors) and also reset the text labels as well but with no success. Would there be something else overriding these settings?

 

Thanks!
Perry 

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