That's a bummer. If it is doing the same thing in each browser, it obviously isn't just the browser. I'd suggest clearing all Dreamhost cookiesm as well as the browser cache. That has worked for me in the past when I couldn't get in and I knew the panel was up (which it is now, I went and checked and just refreshed before sending this.)
Sometimes the cookies get broken with changes ..and I know Dreamhost just changed the ssh key on my server. I couldn't hurt to try.