Okay I made a new user group
 

and now they don't have permission to access my home page?

I am using the CMPS, and everyone else still has access, but not that new usergroup... what the heck did I do wrong?

Maybe you'll have to give that new usergroup permission in the CMPS settings?

how can I do that?

I don't know cause I don't use CMPS.
But in other hacks, like vBshout, you´ll have to give usergroups explicit permission to use it. So maybe it´s the same with CMPS.
It should be in your admincp somewhere.

how do you do that?

go to http://www.YOURSITE.com/forums/admincp/vba_cmps_admin.php?do=permissions and set which "Modules" and "Pages" they are allowed to use.