802.11b broken in -CURRENT?

Hi,

After reading UPDATING, I see 8.x WLAN support is quite different, i.e.:
  ifconfig wlan create wlandev ath0

whilst this works, all I have is an 802.11b AP. The box just won't 
associate.

Whilst I tried 'ifconfig wlan0 channel any:b', this gets further, ie 
both the parent and child
devices wlan0/ath0 show as being in mode 11b.

However scan results still only show 802.11g/a APs.

Can anyone shed further light on this? I know that 802.11b sucks, but 
there's a lot of it out there,
and it just needs to work.

thanks
BMS