Hello Everyone and thank you very much in advance for your timely and precise feedback/input/insights, etc. :-)
Came upon an odd issue due to a website browser requirement by one of our vendors. They need IE11 and it must not run in compatibility mode.
We use Windows 7 (Build 7601 SP1) and IE11 (Version 11.0.9600.19236, Update Version 11.0.105 KB4480965) on our desktops in a FFL/DFL 2012R2 (2x 2016 DC) AD infrastructure.
Our GPO (Computers - nothing under Users) has a few websites listed to be used in compatibility mode (the setting "Use Policy List of Internet Explorer 7 Sites"), but those are older and not related to this new vendor and we do not force anything else into compatibility. On the end-user side there are no entries at all.
What is odd is that they asked me to verify the emulation settings (instructions below)
1) In an Internet Explorer window, press F12
2) A new window frame will appear with a black title bar and 7 tabs to choose from
3) Select ‘Emulation’
4) Under the ‘Mode’ column, the last item is ‘User agent string’. That will be the IE version your session is running. If the emulation is not Internet Explorer 11, contact your IT representative to explore options to allow your internet browser to be IE11
which I did and I noted that although we are using Windows 7 and IE11 the default document mode was set to IE10 and there was an EDGE option, but NO IE11 option in the drop-down box that could be set and this perplexes me. We are using Windows 7 (so no Edge) and IE11 (so no Edge).