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I'm using a clean install of Wordpress, on DreamHost (PHP 5.3 FastCGI), with speed optimization (caching) turned off.
No matter what I do, it's impossible to sign in. By flipping switches on and off for a while the site will eventually fix itself, only to revert. Last night I turned off the minify plugin and it started functioning properly.
My sign in from last night on my home computer works fine (when I remote in) but attempting to sign in from anywhere else I get stuck in a non-function sign in loop.
I invite you to try to register and report back your results.
This is the first screen you get after a login. Please note the contradictory error messages. After this, you sit on a "howdy stranger" page with no ability to move because the whole thing is handled through ProxyConnect.
Advice is welcome and invited.