So you got me wondering if I just got lucky with my RF remote control then:
I am using pin 10 as Slave Select with SPI to a MAX7221, I only made these statements for the receiver:
// Initialise the Wireless Receiver IO and ISR
// set Virtual Wire data input to Pin 9 from 11
vw_set_rx_pin(9); // found this in forum 25 Aug 09
// set the Bits per sec
vw_setup(2000);
// Start the receive PLL running
vw_rx_start();
and only this for the transmitter, with D10 being used as a Column pin for a keypad, and D11/D13 not used.
// Initialise the IO and ISR for VirtualWire
vw_setup(4000); // Bits per sec - had to double from 2000 with 8MHz 3.3V Pro-Mini