Using Cubes - Line Issue

Hello everyone, I am currently in the process of making my first game, and I am having a great deal of difficulty with the level design. I decided to make everything from cubes inside of Unity, mostly due to the fact that I hate Blender, and I have an educational version of 3ds max, and I would like to sell this game. Everything has gone well so far, but I have an issue, when jumping or moving (moreso jumping) these lines appear where a cube (turned into a rectangle) has been placed.

I've tried searching google, and I've been doing my best to find fixes, but I have had no luck.

 

Solved. I should have mentioned problem A. I intended on making this a 2d platformer, I solved this problem by setting my camera to orthographic.... I am a genius