I had this problem too.
I did a clean, plain install of 3.7.1 on a test domain and verified that the problem isn’t WordPress itself.
Doing a binary search through all my plugins found the culprit in my case (the BlazeMeter plugin).
I deactivated all my plugins and confirmed that this solved the problem. Reactivated half of them, found the problem didn’t come back, so kept reactivating half the remaining plugins until the problem resurfaced. Then it was easy to figure out which plugin was causing the issue.
I think kmessinger’s advice is good.
