"Can't access this site data" error

This is regarding blog: http://www.rosalindhartmann.com

I was able to access it first thing this morning, but while in the middle of posting, it said it was waiting for connection. I closed the window and reopened it, now it just hangs and I can’t even get to the site.

I get this when I log into the master WP site of my blogs. http://cl.ly/image/0Q2P2G0S1X2J

Every other site I can log into the admin panel, just nothing on this one. I checked my domain manager (fine and paid, no problem there) and the host server (again, no problem on his end).

Send help!