I have been having blank page problems after updating my k2 theme. I've tried nearly everything and nothing works: the home page and wp-admin pages are still all blank.
Just now, I was toying with renaming the wp-config.php file, and went through the process of creating a new file through a browswer after renaming it. After filling in the info, I hit install now, and got this text:
Now I fear my blog is really screwed.
See here: http://www.small-scale.net/stash