this happens some times...just try refreshing the page...
Also is your Orion server having enough resources?
I've come into work this morning and its working. Not sure I know what caused it but interesting to know it could be memory.
I did try a refresh, I tried 2 browsers and even 2 machines so no clue on what caused this.
still this is resolved now. I'll update the post if it happens again and I find a resolve.
cheers for the help pratikmehta003