I wouldn’t use that plugin anymore. It overrides stuff it shouldn’t and cripples the Unicode usernames feature. I highly recommend using the built-in slug generation methods as well as Unicode usernames if those are needed.
Thanks, but I’ve been using it since the day I created the site so deleting it will now have an impact on my current article links!
Currently, the User Name must only include numbers, letters, dashes, periods and underscores, and the Name will still display Unicode.
Username without Unicode is still convenient for tagging and logging.
Unicode on urls is common, but will need to be considered for this.