Are there any non-alphanumeric characters in your password? I believe the Humax is quite picky about this and there have been reports of people having to change their passwords in order to get a connection.
The joys of wireless networking !!!
The only garanteed solution is to connect a network cable between the 2 devices.
Funny thing, my Realtek-chipset Ebay-special dongle which worked fine until now (and still does -- 'cos it detects my neighbour's wi-fi) resolutely refuses to connect to my network any more. I added a TP-Link range extender WA830 and everything else seems to hook up as normal. I hammered in the wi-fi settings again but it won't have any of it. Have pulled my hair out for several nights. Would anything in a recent firmware update (which sneaked in one night) have affected the wireless connectivity I wonder?