After opening my map nothing shows up in the editor until I hit I to invert the selection. Everything is still there but when I try to select something everything disappears again. I tried going back to an older file but it is doing the same thing. 

prob got those filters turned off

press F

Have you change hard drive? Because if your hard drive corrupted and have to change then there's your problem (If I think your word 'editor' is radient, then most likely you have a diffrent hard drive on your pc) cause mine did that long time a go and did what I mention above,
And sadly I could not fix it tell I bought a new officially installed  "operating system" (a pc)  because previously I could not spwan a light grid volume.with the changed hard drive. And no, using stock drivers and ported them to a non broken hard drive can fix it. Sadly