Have you tried cleaning the Printer heads George?
I don't have an XP55, but my SX435W has a Print head cleaning program - which often fixes that same issue that you are experiencing. Plenty of Epson printer manuals freely available on the Epson website should that not work?
XP55 manual and drivers can be found
here
Having reread your post again - if its printing photos and documents without problems it can't be the print-heads at fault! Maybe you need to remove/reinstall the drivers in your PC? The latest drivers can also be downloaded from the same page linked above.