I, too, couldn't print from 2 iMacs using Mavericks and one MacBook Pro using Snow Leopard after applying the Epson printer driver update 2.18. Our Epson WF-7510 printer was connected wirelessly to our router, but our computers couldn't connect to the printer. Message was "Printer not connected" or "No communication with printer".
After a few hours of searching, I found a video at Epson Support that suggested to unplug the power cord to our router for 30 seconds. Then plug it in, wait 30 seconds, and then try to print. After following that procedure, I went into Printer & Scanner Preferences, and deleted the chosen Epson printer driver,
After deleting the driver, I then added the Epson driver for our printer. Then I tried to print, and test sheets printed from both iMacs. As for the MacBook Pro, I had to restart, after which I could print.
So, in summary, try unplugging then plugging in your router (if printing wirelessly). Hopefully, this will help.