I run local site to test every theme and plugin to make

Hi I run local site to test every theme and plugin to make sure they working right before I go live. I had install WPMU DEV Dashboard on couple of that site. They working fine until this morning.... One of my local site the WPMU DEV Dashboard not working. It looks like I got locked out. I took liberty to take a screen shot from my desktop, but I could not upload it. Basically, the screen right next to left panel is BLUE. Is there any body on this community has the same problem as me in the past?