Is this happening to anybody else?

There was a known issue about this that was looked into last night so it's possible the fix hasn't fully made its effect on your browser. Try clearing cookies and cache again but make sure it's clearing everything. If the old XWF cookie is left behind it will cause this error. You need to LEAVE the XWF site before you clear everything, and then revisit the site fresh.

If it's still happening, try closing your browser completely and then re-opening the XWF site after you open your browser again. That might take care of it.

If none of these things take care of it, then let me know what browser you're using and its specific version number.