The Epson R2400 is a great printer, but has two different main black inks - Photo (i.e. glossy) and Matte. I got my printer profile today, and wanted to try it out. Sadly I had just swapped on to the matte inks, so had to switch back.
Of course the printer driver didn't spot I had swapped the ink cartridges so the list of papers was. Well internet to the rescue againg.... solution is here. Go into the Epson ink levels utility, click about a bit, and things work.