wordpress uses a decent amount of javascript, if your version is corrupted, disabled, or missing it will have problems.
do you have any admin themes installed? what plugins?
I done a system update this morning and it appears to the be latest version and working fine.
The plugins that are active are BM Custom Login / Contact Form 7/ Genesis Simple Edits / Genesis Simple Hooks / Login Logo / No Right Click Images Plugin / Subscribe Me.
I have deactivated all of these and it didn’t make any difference.
I dont believe we have any admin themes installed. it all looks standard along with another wordpress site Im working on.