Actually, I'm referring to what happens if you simply put in a line like
Deny from somename.net
without changing anything else. The moment anything other than a CIDR range appears in your mod_authz list, everything in the server's innards toggles over to Lookup Mode-- which I assume has a technical term that I don't know-- and it stays that way until you hunt down and remove the offending line. Same thing happens if you throw a RegEx into the same list. I remember there was some discussion about this, probably in SSID, but it was a goodish while ago.