Not only do I have the mouse and keyboard problems mentioned in other topics but I couldn't even get the game to start until I set full screen to 1 in the settings.ini. The game is unplayable. I can barley even get past the menus because of the mouse and keyboard problems. When I finaly got to the first campaign mission the lag was incredible.

I'm running at 1280 by 1024.
I'm also on the demo version.

Any help would be greatly appreciated, I keep hearing how kick ass this game is and just want to play it.

What kind of a computer do you have? The game does need a relatively good processor to be able to run smoothly.

I have a fine computer. Nvida 6600gt 2 gigs of ram, and a 1,8ghz processor (sigh).

Switching to build 19 seems to have fixed all troubles though, whats the deal with B20?

That is odd. Your computer should be able to run the game fine. There weren't any major changes between 19 and 20 that would cause a lot of lag like that.

Not only the lag, but the keyboard and mouse problems.

I have exactly the same stuff as you (except my Nvidia graphics card is 8400), and I can run the game fine. It lags only during mass amounts of physics to process at the same time (ex: forty+ actors on the map, a series of huge explosions or using the ypsilon or judgement cannons). Are you playing on a table computer or a laptop?

Also, have you tried restarting your computer, or even reinstalling the game?