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Use Firefox and access it.  I had this same issue a few months back and it was something to do with a glitch in the system and an update to FF and IE. Once logged in try going to this link  http://analytics.moz.com/manage-campaigns it's a work around for the time being. And make sure to Contact support help@moz.com and relay your issues.

Just wanted to leave a quick note saying that SEOmoz has upgraded the Link Directory! You can view a post Cyrus wrote with more information about the directory updates and link building via directories at http://www.seomoz.org/blog/seo-link-directory-best-practices

I would encourage you to look at Google Webmaster Tool data and observe clickthrough rate averages around different keywords and derive phrase potential by predicting traffic scenarios if position for that phrase increased by n positions and how much it would yield in terms of conversions.