I seem to have it working now, after a few more cleaning cycles and changing some print settings in Lightroom. I did have GE on for the whole paper, so that was not the issue. What I did was changing from "Vendor" (what a silly name!) to "ColorSync" in the print dialog box and then inputing the paper profile in the color management bar in Lightroom. Strange that it was fine before, though...My B&Ws are printing fine now, but I still get bronzing (though it's diminished) in saturated color photos, especially tree trunks, where a lot of gray ink seems to be used. Do any of you have this experience? Have any of you ever had any bronzing in your prints?
Anyway, the reason I take the powercord from the wall socket when I am away for a long time is because of electrical storms that are all too frequent here in the summer (I live in Rio).
Thanks for all your replies, by the way!