4
I make this mistake every time I add a new block or module to my site. I've been using XOOPS for over 2 years and I still have trouble with this.
Of course, it works when you're logged in as admin, but then you go and show your work to someone else who is an anon user, and they say "hey, I don't see it."
I wish that there was a preferences switch that controlled default permissions for new modules and blocks.