Creating new API fails on IE

Creating new API fails when using Internet Explorer. I get an red error message at the bottom: "API <name> not found". 

I can successfully create APIs when using Chrome on the very same Apigility skeleton running on the same PHP built-in server instance.

However, the it seems that the API is created on the file system, but Apigility Admin running in IE cannot read it back. If I load/refresh Apigility Admin in Chrome then the API created in IE appears.

IE version is: 10.0.9200.16576