Hi,
I'm using:
Microsoft Edge 38.14393.1066.0
Since this is a corporate laptop, I made not have the absolute latest version of Edge. I believe Edge updates are considered part of the OS and so aren't automatically updated unlike all the other browsers.
Closing Edge when it has multiple tabs open and reopening it doesn't help. I have one tab that complains about the proxy server, both before and after. The bad tab doesn't work if I refresh it, but if I open a new tab and paste the url from the bad tab over, it works.
-Eric