I stumbled across this site looking for an answer as to why I could not print with my new smc router. I read alot of similar problems with the printing and the router. What fixed it for me was to start the epson spool manager from the start menu. Then go to queue, then setup. Check the box that says "use print manager for this port". Printing from all my computers immediately after making this change worked perfectly.
Hope this helps. If it does, let me know.