Boot menu and USB keyboard

[Gianni Doe]

I've got a USB keyboard and I'm unable to select any of the options in  
the boot loader/beastie menu - escape to the loader prompt, single- 
user mode etc..
It is the only keyboard attached and it works fine once the system is  
up.

I've done a bit of Googling and tried setting hint.atkbd.0.flags="0x1"  
in loader.conf but it doesn't make any difference.
I'd appreciate some suggestions.
Thanks
Gianni