I switched from my matte black to photo black cartridge and began printing on epson premium luster photo paper when I noticed large black blobs appearing on the print. I’ve attached some photos to illustrate what’s happening. These blobs don’t show up when I run a test print only when I try to print a file from an application like Photoshop or Acrobat. Can anyone guess what might cause this. I’ve run several head-cleaning cycles and several test prints but gaps still remain. The blobs though are killing me!