dwepdump, no output and "-a" problem

I've had no success yet in using DWEPDUMP in trying to collect
packets in order to "crack" my home network's WEP keys.  I always
end up wiht a 0 or 24 byte dump file even after days or running
it with confirmed traffic between my 802.11b AP and Client. 
I also get the "illegal option --a" problem.  I've spent a couple
weeks figthing with it and I've read through all the postings
here in BAT and any related solutions I've found have not yet
solved my problem (hence my posting of this new request for help)

I've made sure that my wi0 is up and properly set to monitor
mode (prism2ctl wi0 -m, ifconfig wi0 up, wicontrol -p 3 -f [my
channel]).  I've tested with Dstumbler and it works (I can see
many AP's including mine).  However, Dstumblre does NOT work
with the "-o" option even though my Prism2 card is in monitor
mode (I find this strange and suspectful).  I've also tried using
Prism2dump and I get no dump showing up on the screen.  My guess
is that it seems something is not right with Monitor mode and
I don't know what it is.  My FreeBSD machine can otherwise connect
to my WEP enable AP without any problem so I know the hardware
and basic wi driver fuctions are working properly.

Here's my setup:
802.11b AP - FreeBSD 4.7 server with NETGEAR MA401 in AP mode
(wicontrol -p 6), 64 bit WEP enable (I've also tested by listening
in on my Neighbors Linksys AP with WEP aslo with the same results)
802.11b Client - Various NIC's on various Win OS'es (Lucent Wavelan
Silver, Nortel/Spect24, Dlink DWL-650)
802.11b 64bit WEP test traffic - File transfers using FTP, SFTP,
windows file sharing, HTTP, ICMP using various sizes of packet
(10-1500 Bytes)
Dwepdump v0.2 machine- FreeBSD 4.7 non-patched wi drivers AND
I've also tried FreeBSD 4.4 with source mod patched wi driver
and succesfully rebilt kernel.  I've used two differnt Prism2
Cards:  Netgear MA401 and Dlink DWL-650 (firmware v1.03.05)

I've read many success storied her in BAT with similar setups
so I know I must be able to get mine working.  I'm hopefull that
I've just missed a simple setting somewhere but just need some
help from BAT in finding it.

Thank you in advance for taking the time to read this (and hopfully
respond).
Al - [email protected]