I've downloaded the evaluation version of PhpStorm 2019.2.1, and added + enabled IdeaVim.
It worked fine for a little while, but now once I enter Insert mode, I can't exit by hitting Escape.
If I uninstall and reinstall IdeaVim, it returns to Normal mode, until I hit i
(or similar) and then I'm back to the same problem.
No idea what else to try, short of re-installing PhpStorm.