Nope, not had that. Are you on the latest version of the app? And if you have not turned it off once since buying it and updating everything... have you considered one reboot?
I get this when the email is a picture with text rather than just straight typed, promotional stuff from ebay and the like. I've never actually figured out how to fix it though
Just got my moto x. Very pleased with it for the price.
The only thing is some of my emails into the gmail app are coming up empty. When I check on my iphone the text is there.
Anyone else had anything like this?