I have had no time to look at this in the meantime but have just checked again (trial license about to expire!). When I connect 505 to router by cable everything seems ok. Authentication on router is WPA2-PSK (Meteobridge uses this for encryption- could this be the problem?), encryption on router is WES, the correct SSID is displayed, IP by DHCP and the passphrase is correct (contains letters and the @ character). I then disconnect the cable, unplug the 505 and plug it in again and it does not go beyond the fast flashing green light stage and does not appear on the network using an IP scanner. Signal strength is OK and router operates in 2.4 GHz band.