Windows – Ctrl+Shift+F stopped working

I use CTRL+SHIFT+F in various programs to perform a 'Find in Files' function. (Visual Studio & Atom for example)

• Other CTRL+SHIFT functions work (+H
  & +G for instance work fine in those same programs)

• Tried this same keyboard in another system and
  CTRL+SHIFT+F works fine
  (F key works fine in those same programs)

• Tried removing the device in the device manager for the keyboard
  and re-discovering

• Tried resetting the settings configurations for the programs
  that used this shortcut – nothing

• Tried this online keyboard tester (http://en.key-test.ru/) and
  the shortcut works there

• Windows On-Screen Keyboard also cannot perform
  CTRL+SHIFT+F in those programs

• Tried repairing Visual Studio which essentially re-installs it and reinstalling Atom

I'm not sure what else to try. It stopped working when I upgraded from one Visual Studio version to the next available however it also simultaneously stopped working in Atom. Are there some other areas of settings that need to be flushed? I have to assume that was just a coincidence…