Somehow, my vertical bar ('|' or Shift+'\') key has become mapped to shift focus to open explorer windows. I've found that it occurs in any text editor, including Visual Studio & notepad. When I type the character, it won't print the character in the editor if I have an open explorer window. It just switches focus to it. If I don't have an open explorer window, it will print the character normally.
How can I fix this?
