v4.0 (all SP) related

User(s) suddenly getting a lot of permission error though no changes have been made to the permission setup :
Perform Security \ Synchronize

Determine which application uses specific keyboard shortcut or hotkey

Find out what program is using a hotkey (2015-11-11)

Sorry I can't suggest an alternative to Hotkey Explorer for Windows 8 or 10. It's a godsend on Windows 7.

I can only offer you the most primitive way of handling this problem. First, close all your running programs (including stuff in the system tray), one by one. Make notice of what you close and every time (or every once in a while) test if your program (is it Greenshot?) can now use that hotkey.

How can I determine which process owns a hotkey in Windows?
Hot Key Explorer (but NOT for Windows 8 or later)

Related
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Disable Ctrl+Alt+F1 for Intel Graphics application :
I kill the igfxHK.exe process with Task Manager
source: Cannot catch Ctrl+Alt+F1 in WinForms MDI. Is it special?