I just updated my imac to yosemite and now my 2 epson printers, pro stylus 7900 and 11880 will not print through CS4 and the printer drivers. I send the information and the printer hums and haws for a minute or so ( the screen on the printer itself says printing ) then it feeds the paper roll down and cuts it, as commanded, but no print, just a blank piece of paper. The printer does print from the preview screen on my imac but not the photoshop CS4/ epson printer driver way. This has never been a problem before. I have spoken with Epson extensively and done everything we can there....Please help!!!!