full graphic smart controller missing lines

Hello, everyone.

I'm having trouble with some missing lines in the raprap full graphic smart controller. It works just fine with my other printer, so it's not the LCD. I'm using the classic arduino 2560 + ramps 1.4 combo.
Yes, I've included the U8glib library, and it is the last version downloaded on github. The Marlin is a copy from the previous working one aside from mechanical settings.
I've attached an image file
Searched the web for similar issues before post. Unsuccessfully, obviously.
Thanks in advance for any tips!

I once had a Problem Like that because I tightened the case around it too strongly, so it was just very slightly bending the Screen and missing lines Like that appeared. So maybe try losening the screws?

It's worth a shot. Thanks, Ramon!

I had this issue. Google found your post. It solved my problem.

Registered so I could say thank you, and confirm to others that this is a very probable solution to this problem.

thanks.