dstumbler and usr2410

hi all

I use OpenBSD 3.1-current, usr2410 (prism2) and bsd-airtools.
Initially dstumbler doesn't work with this card, after the last "make build"
the card started to work (with dstumbler).
After that I did a bad thing: I've upgraded the firmware card to 1.4.9.
Now Dstumbler detect the Access Point, but the signals(Q/S/N) are all 0
zero)!
However I've seen another positive thing, the (Q/S/N) of wicontrol started
to work, while with the old firmware didn't worked.
Has anyone noticed this defect ?
Another little question: Is it normal that dstumbler works well with or
without the "-o" option ?

thanks to all the list...


Giacomo