One of our customers, who uses WordPress multisite has been trying to add new users from the WordPress dashboard under Users...Add New
The usual form for Username and Email is visible, but there's also a red warning saying 'ERROR:Please enter a valid CAPTCHA value.'
But there's no CAPTCHA question visible to let her put in a value.
As a workaround she disabled the CAPTCHA plug-in for a 30 seconds so she could work with the form.
Is this a small bug in the plug-in or is there something else we should try instead?