Looks like a GPU issue. Does this happen for any other 3d games on your pc?
Are your graphics card drivers up to date?
I also see you're using EasyFPSEditor 1.5, not CE. Does this issue still occur with EFPSE CE?
Viewing post in Green lines when testing the game
Thanks for your reply.
The issue fixed itself after restarting PC several a couple of times. I think it was, in fact, something related to GPU or the Nvidia Card. It has only happened with FPS Editor so far.
Also I updated the drivers, so maybe that was the issue.
I tried with CE and older versions.
Regards.