I use Googles mail. I've never had problems with coupons in the past except this new one and the one prior. Probably because I've been online got the email and used the coupon the day I got it in the mail. I've just tried going back further into my mail to try and see if I could give you a date on when this started, but it looks like it's on just about all the messages that come over with the black background. Whether it's a coupon, sales flyer etc. The content looks like it all fits, until you highlight a black spot and there is writing. I really haven't noticed it before until this last coupon. I didn't check my mail for a few days and when I saw that coupon I kept looking at it for a date on when it expired, hence my first post. Then I highlighted it to be curious and there is all the fine print so to speak. So that prompted my 2nd post. When I got the latest coupon, I highlighted it again and posted it in the image. I know I've seen expiration dates on the coupons from here.

 

Edit: Just wondering why only parts of the white type is blocked and not all of it if I were having issues on my end. I only get "if you are having issues.." link. But if the message looks fine, I wouldn't use that link. I guess I'll have to highlight the messages from now for stuff. I got the Display all images for this email if I was getting it for the first time. I selected display all the time from Renderosity when I started using gmail about 3 years ago so it doesn't give me that option anymore.