I'm wondering why underscores aren't allowed in the URL name for neither the blog name nor the category names...
For example, if I wanted to name a category URL (Graphic Design) as graphic_design, I can't do it... Is there a way to enable underscores...? Is there a reason why underscores should not be used for category URLs ?
I tried creating the category URL name with a space in it and got the same error... the Category name itself can have spaces, but the URL name apparently can't...
General Support
b2evolution CMS Support Forums
I believe Cat & blog names spaces are reverted to underscores in URL's. Probably that's why you can't use them in the names themselves.
--ƒ