Ethereal sees no traffic while SmartSniff has no problems?

Hi,

I just installed both Ethereal (ver 0.99.0) and SmartSniff (ver 1.21).

When I click on the "List of available apture interfaces" in Ethereal,
I see no traffic on any of the interfaces, including the D-Link
DWL-G650 AirPlus PCMCIA card that I'm using for connecting to my WiFi
network.

On the ontrary, when I launch the SmartSniff, it sees the traffic very
nicely on the above card.

Can someone please help explain what I'm doing wrong with my Ethereal?

Appreciate any feedback.

essbee