[kh99]

Well, that's one place, and changing it to a semicolon allowed me to enter tags separated by semicolons, but some of the display code still uses commas. In that same file around line 894 there's this:

	public function fetch_rendered_tag_list()
	{
		$taglist = $this->fetch_existing_tag_list();
		return fetch_tagbits(implode(", ", $taglist));
	}

and then in includes/functions_bigthree.php around line 435 there's function fetch_tagbits($tags) which expects a comma-separated list of tags. That function formats the list using a phrase $vbphrase['comma_space'] (and you probably don't want to change the text of that phrase because it's used in other places).