Well, SOMEHOW

This issue resolved itself(!) after restarting a bunch of times after I had done some menu.lst editing. Before, I wasn't able to connect to the localhost server in PCC, and after trying unsuccessfully to get it installed via cups, localhost:631/admin -- authentication username and password kept failing -- I tried going back to PCC and, for some reason this time I WAS able to connect to the PCC server, and all went well from there. I (to my knowledge) didn't actually do anything to fix it myself, but will mark it as solved just the same.