This has been going on for weeks and I'm pulling my hair out. I have WP 2.8.5 and theme version 3.4.4.
Without warning, I can't click on a link on the home page and get to a single post page. All I get is a blank white screen. I've been eliminating plug-ins one at a time, first based on the most recent I installed, now just based on the ones I am willing to give up most. Each time I deactivate a plug-in, the site functions normally for a short period of time. Then the problem recurs. One of my writers pointed out that the only way he could access pages normally was if was logged out of the site. I tried that and yes, when I was logged in I got the blank white screen. When I logged out it worked. Now I get the blank white screen no matter what and I really don't want to lose any more plug-ins.
What could be causing this? I've had so many strange issues in the past month or so; before that everything worked beautifully.