After the last update, any pages that use a ?=redirect in the URL redirected to a blank page and didn't function.
For example, I could not logout. The logout function redirected to a page containing the logout code and it was simply a blank white screen. I never actually logged out. If I changed the settings on a plugin, the URL that brought me back to the settings page uses a redirect in it. That would also be a blank white screen (although the settings changes were actually made).
I disabled all my plugins and the problem went away. I enabled them all again and the problem came back. So it's a plugin issue, no? I disabled them all again and started turning them back on one at a time. When I activated MyLinks2, there was an error message at the top of my screen about "unexpected characters" and I should contact the plugin author for support or disable the plugin.
So I disabled it. Everything is running fine, now. I hope this is of some help to you. I wish I had a more precise description of what is broken, but I'll be happy to answer any questions (if I can).