I installed the latest 18.1
created a new workspace.
Compiled the "empty" new Webapp.
got a 500.9 Permissons user.
Added iUsers group to permissions in IIS manager (Isn't the studio supposed to do this?)
spent ages trying to figure out why the CSS wasn't displaying.
Tried the site in IE. - Perfect.
Attached screenshot of IE & Chrome & Chrome "About" screen.

Click image for larger version. 

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