I'm having trouble connecting and printing wirelessly to my Brother HL 2270-DW. I have the latest version of Lion, the latest MacBook Pro, and the latest Airport Express and Airport Software. I suspect that my problem stems from the latter. I am using WPA-2 with mac address filtering. I already allowed the printer's mac address to access my network, so that shouldn't be the problem. When I try to print something, it says that the printer is "offline". Could anyone help me with this problem?