[EMERGENCY] Game won't load any maps :(

Your PC do not meet the minimum requirements to run the game.
Your GPU is way to outdated to run the game. Specifically, the game requires a DirectX11 GPU, your is only DirectX10.1 capable.
Yet, our game also support DirectX10.1 GPU in extremis, but in the current version there is a bug that makes the game crash whenever you load a level using one of those GPU.
We already fixed that issue, and our next update will bring that fix. This update will come out very soon if you want to wait (trust me, very soon)

You said you were playing the 4..0 version?
DirectX11 was introduced with update 0.4.1.0, so you were probably playing with an older version that was running on DirectX9.

 

Uhm, at the current state the graphic engine is not still optimized as it should.
You would need a good GPU if you want to run with the settings crancked up.
A GTX960/970 or AMD counterpart would be good I'd say.

Your CPU may also give you some problems, not entirely sure, but looking at some benchmark sites, it scores lower than a FX 6300, which performs terribly in BeamNG.