theme size on screen with

hallo,
can someone please suggest me that how can i solve this issue.

since i have updated my wordpress from 3.7 to 3.8 my wordpress.the half of my monitor screen is blank with wordpress and this same problem is appering in every screen
when i use again twenty thirteen themes at the place of twenty fourteen theme then i don’ have any problem with size.
as far as i can think there is only problem with tweenty fourtenn theme.
please trouble shoot it.

i am kindly requesting you to help me out for it.