Just updated to Yosemite and now can't print to the 9900 from photoshop CS4. It acts like it is going to print and then just feeds the paper through, cuts it and acts like it's done. All printing software is updated and firmware is current. Ideas?
First, check all your print settings in Photoshop and the printer driver dialog -- make sure it really is set to print something.
Then check Epson's website to make sure you have their latest driver (they did have to fix a few bugs on MacOS 10.10).
If none of that helps, then you need to talk to Epson. It sounds like the driver is failing to process the image data correctly, but is not returning an error to the application.