Strange Outline Around Blocks

[MM83]

Recently, I've noticed this bizarre line surround blocks. It's really bad at a distance but not as noticeable from very close. It happens in vanilla Minecraft as well. It also only happens on my desktop; not my laptop. I've included a couple screenshots of this. Any fix? What actually caused this to happen?

 

[Nerixel]

I got this as well. It stopped when my graphics card stopped running with FTB, for some reason. So it could be related to your graphics card. Which one do you have?

Try right-clicking on the FTB launcher, go to "Run with graphics processor..." and click "Integrated Graphics". Your FPS will most likely be significantly lower in game, but what's important is: are the lines still there?
P.S. If the "Run with graphics processor..." or something similar doesn't appear, you probably don't have an Nvidia graphics card, in which case I can't help you.

 

[AliveGhost]

Yep, this is to do with your graphics card. If you have an Nvidia, change the slider to quality, or balanced, that should help.

Sent from my HTC Desire X using Tapatalk 2

 

[MM83]

Changed a couple of settings in the Nvidia Control Panel and that completely fixed the problem! Thank you guys so much!