SurferTim:
I don't know if this is your problem, but maybe a response header would help? Web browsers like that kinda stuff.// add this before the document body
e.print("HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n");
// now the rest of your document
e.print("wArd");
Otherwise, it appears to be running out of sockets. That happens in the w5100 if the connections are not closed properly, but I know little about the ENC28J60.
Its working like text, not like header (((