Unable to load mission after installing first patch

[ROXunreal]

The patch has screwed up my game. Made the menus much more buggy, I cannot go "back" once I click something on the menu, clicking the back button doesn't work, pressing esc doesn't work...

But more importantly, I cannot play any mission, it won't load, but will give me the following error:

Method not found: 'Int32 maddox.sound.WGroup.getHandle()'

I really hope a solution for this is found soon. I could play the game before the patch, with horrible performance on my not so good system, but I could at least dogfight over water at about 20 fps. Now I can't even load the mission