Game vanishes, come back to oddities

[Wounder]

I Alt-Tab'd out of the game after pausing when one of my kids showed up from nap with... let's just say issues. When I came back from dealing with that and getting nap back on track, no Dead Island, no Steam. I restart Steam, start Dead Island and when I hit continue, I'm stuck in the lifeguard shack with 0% completion, no way to get out of the building and all my key bindings gone missing. Oh, and my DLC is corrupt.

Speaking of key bindings, I don't like WASD and changed things to ESDF... but now anytime I turn left, it acts as though I have also hit Use. Use is bound to "V", mind you.

Any suggestions?