How much of your theme did you alter or modify?
When did this happen and was this happening before?
What was the last thing you did before encountering this problem?
One thing's for sure - you need to go back and fix some errors in the HTML coding. If you try validating your site (and granted, Kubrick won't validate too well on its own), you'll see that there are a bunch of errors in there that need to be fixed.
If everything was working perfectly fine and you posted something and the theme broke, it's because some garbage coding (I call it garbage because it breaks valid HTML coding) in your post broke the theme.
If everything was working perfectly fine and you altered something in the style.css or ANY of the php files and it broke, then something you altered broke the theme.
If you did absolutely nothing at all and your theme was working fine and suddenly went kaput, then I suggest uninstalling WP and reinstalling WP and seeing if it fixes the problem.
More than likely, though, my hunch is that some 'garbage' code is causing the screwup.