How can I add a Stream Analytics table storage output?

Question

I am following this Azure IoT tutorial. One of the last steps in Azure is creating a Stream Analytics job with an output to table storage. Following the tutorial, the first Stream Analytics job output can't be created.

Clicking the "Create" button on the "New output" blade only sends a request to ensure the uniqueness of the Output alias and the validity of the Storage account key. Nothing else happens.

As you can see in the screenshot, both are valid, but no attempt is made to actually create the output. No error messages are displayed. No Javascript errors are on the page. What on earth must I do to actually create the output, since the "Create" button clearly doesn't?