UAC box not accessible when "modern" app is open.

Question

Problem:
Modern app and UAC don't work well together.UAC box is impossible to use (to answer Yes/No on security warning)
To reproduce:
Go to User Account Control Setting and lower the setting to second from bottom ( to not dim the screen).
Download an EXE program and start the installation.While it installs, open and use a modern app like OneNote.While you're using OneNote, the installation on background opens a UAC box to ask for a confirmation.However,the UAC box is not visible.At this point
it's impossible to use OneNote app but you can use all other things on the PC.When you minimize OneNote, the UAC box is not visible.Click anywhere on OneNote app and you hear a sound (as if it's telling you that you have an active pending box that you have
to close before using that window) .When you maximize the OneNote app the UAC box becomes visible for 1 second then disappears again.The only way to solve this is to right click on OneNote icon on taskbar and Close it.The UAC is still invisible  ! You
have to run the program installation again.

Answer 1

We tried request scope but that caused other problems. We aren't really looking for the constructor to be called with every view, just when a new instance of the application is invoked (by clicking a link in an email). Right now, if the user opens a new browser from the start menu and pastes our link into it everything works fine. I think our problem is in IE and Windows. Perhaps we'll try request scope again and see if the problems that causes are easier to solve than this.
Thanks again for your help and your fast replies,
Dave