GAE API响应不再显示在API资源管理器中

I have a cloud endpoints enabled project on Google App Engine. I recently went on to the API explorer to hit the API methods directly and their responses are no longer being displayed on the screen below the "Execute" button like before. It just displays the time to execute. However, the clients who use the API aren't having any problems. Does anyone know why responses are no longer being displayed in the API explorer?I have a cloud endpoints enabled project on Goo