Strange Green Line glitch on Kerbin

[Random Tank]

I was testing a plane design and suddenly these green lines appeared around the KSC:

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I have no idea where they have come from, I don't know whether I accidentally pressed a button to make them appear but I've rolled my face on the keyboard and they don't go away...

They also now appear in the Space Centre Screen, when they didn't when I started the game up...

I play modded, here is the list of mods I use currently.

Will I need to upload the game log file to help with this? Thanks for any help people can offer....

Edited August 23, 2014 by Random Tank
Answered

[Kasuha]

Can you reproduce it reliably or was it one-shot accident? If you can reproduce it, you can try gradually removing your mods to figure out if it isn't one of them.

It may be also glitch in memory of your graphics card, perhaps if it overheats.

[Random Tank]

I tried restarting the game and it was a lot quicker to appear this time... I'll try taking out my mods, but I haven't installed a mod in about 3 weeks, my graphics card is overpowered for what the game needs so it isn't running hard, and I only cleaned out my PC ~2 weeks ago... I'll report what i find

[MarvinKitFox]

The symptoms exactly match dead memory in your card.

I hope it is not!

[Random Tank]

The symptoms exactly match dead memory in your card.

I hope it is not!

I hope it isn't either... What causes dead memory?

[General Rarity]

I had this problem before, I'm thinking it's with Kopernicus because I removed it from one save and they stopped appearing. No problem since.

[Random Tank]

Hmmm well, I manged to get it to repeat once, but now I can't do it again... been mucking around with spaceplanes and planes on kerbin for hours and they still haven't appeared again...

I had this problem before, I'm thinking it's with Kopernicus because I removed it from one save and they stopped appearing. No problem since.

Ah right, thanks for the tip! They aren't obstructive, but if they appear again and keep appearing I'll ditch Kopernicus... I'll mark this as answered, thanks guys!

[Aegrim]

Just happened to me, was testing my space plane around the KSC, did a half loop upwards and rolled so i was traveling in the other direction. Press CTRL to lower throttle and they appeared.

[TheMoonRover]

The green lines are something to do with testing if the terrain system is working with Kopernicus. There're keyboard shortcuts to turn them on and off. I don't know exactly what but it's Ctrl and something to turn them on, and Ctrl and something else to turn them off, I think. I remember reading about it somewhere on the Kopernicus thread.

[HotSandwich]

Ctrl+s turns them on, Ctrl+c turns them off.