Cannot close editor

So i cannot close unreal editor when I click ‘exit’ or the ‘X’ nothing happens

For now I’ve just ‘end tasked’ it, but that makes me nervous. I haven’t encountered the issue with any other software on my computer. Issue started happening after I applied latest update

Windows 7 SP1 64 bit
i5-4670

image to prove I’m not totally stupid

Imgur

This is a copy of another question, here. A staff member has said “This [bug] has been confirmed to no longer occur in the upcoming 4.17 release”