I encountered this weird issue this week. Suddenly, my favorite keyboard shortcut, Ctrl-W, stopped working. I checked for browser updates – nada, I tried in other browsers like Google Chrome and Microsoft Edge and discovered the shortcut had stopped working in all my other web browsers as well. Other shortcuts still worked that used both keys. I restarted, checked my keyboard settings to make sure it was on Windows mode… nada.

Finally, I found the source of the issue. I have Samsung Magician installed and there was a pending update and apparently that disabled Ctrl-W keyboard. shortcut. Install the update and you should find your shortcut back, just like me!