Problem
Suddenly (near the 0.50 release) the IdeaVim plugin stopped working in IntelliJ, all of the commands were unresponsive. Without success I tried:

• Invalidating and restarting IntelliJ
• Uninstalling / disabling the plugin
• Installing previous versions of the plugin

The keymaps listed in IntelliJ Preferences -> Keymap -> Plugins -> IdeaVim were all empty. The only keymap that appeared in this list was “Vim Emulator” (Alt+Cmd+V) which conflicted with MainMenu -> Refactor -> Extract. I’ve never used this command before, Vim emulation has always been enabled by default.

Solution
I was able to resolve this issue a couple of different ways:

• I added a new keyboard shortcut for “Vim Emulator” which did not conflict with anything (Ctrl+Shift+v). This immediately enabled vim emulation and the issue was resolved.
• Opening the IntelliJ action menu (Cmd+Shift+A) and searching for “Tools: Vim Emulation” I was able to toggle the same setting on and off.

I’m still not sure why this suddenly became an issue. I’ve also provided this information to their issue tracker.