Ethereal, W2K and 802.1q tags

Hi Everyone,
I'm looking for some help in getting ethereal to capture
and display 802.1q packets using W2K.

I have mirrored a port on a switch that has 802.1q traffic. When I
sniff on the mirror port, I either see no traffic at all , or, the
traffic I expect but with the tags stripped. This depends on which
laptop I use.

I've read the doc at wiki that states that if sniffing on a mirrored
port, "You'll definitely see the VLAN tags, regardless of what OS the
independent system is running or what type of network adapter you're
using."

This statement appears to be incorrect.

Any help would be much appreciated.

P.S. when I use snifferpro, I see the 802.1q packets.