Maybe you have deleted the service that's the reason it's showing blank content. I have created a service and then deleted i can see as below image. So, can you cross check once again by clicking on the create service. Post the errors in question further.
Or else refresh the project console or browser console and give a try.
I was having the same problem, I found out that for some reason the IAM Service was deactivated, I was able to activate it following the link in this page:
https://cloud.google.com/iam/docs/creating-managing-service-accounts
After activating for my current project all the google cloud console screens started to appears again.
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