viewport is all black, wont render assets or lights... help?

so, ive a scene with around 1000 assets or so where nothing had gone wrong and everything was working fine just unitl 2 hours ago. i restarted the engine trying to install the maya livelink plugin (i’m not sure if this has anything to do with it) and all the sudden my level just renders black with all the decals and light icons looking up and everything else is black. to check if it was just the level, i opened the first person example map which turned out to look like this…

BP_skysphere is the only thing rendering.
and my level which now looks like this…

i really need to get the levels back for the project. what do i do? all the meshes seem to be rendering fine in the mesh editor and so on.