I'm a big fan of this plugin, and am familiar with how to use it correctly
While adding a number of redirections, I was surprised it was not working, and noticed this issue.
If I take /old-url/ and Match URL only and Action Redirect to URL /new-url/ it creates this below and the redirection does not work:
I figured this out by opening up the green to edit and was surprised to see this. Not sure what is causing this. Regular expression is not checked.
If I edit the redirections it works, but is sort of cumbersome to do.