text disappearing in composer

Hi,

I'm working on some instructions for a part. Yesterday at the end of the day I saved the composer file with everything in tact. today, some letters are missing from text boxes in my project (see picture). It has happened on both views with text boxes. Any help would be appreciated.

Kind regards,

Ben

The below text box should read DB20 Slit Mechanism Assembly Instructions

SolidworksComposer