dstumbler not displaying results

Hi all,

FreeBSD 4.7-RC (10/08/2002) on a Acer Travelmate 507T with a Orinoco
PC-Card Gold. dstumbler used to work just fine and detect every AP with
the same hardware running 4.4-STABLE. However, after reinstalling the
system with 4.6.2 and bringing the system up-to-date with cvsup,
dstumbler doesn't detect a thing. Actually, it seems to detect APs but
it won't display them. While dstumbler (just "dstumbler wi0") is
scanning, "wicontrol" will display that it is switching channels,
wepmode from on to off and even seeing remote APs in the netname fields.
However, dstumbler won't display anything in its interface. 

The only situation where the display is actually showing some result is
when I previously assigned with an AP manually. That is, when I assign
with my local AP here and then run dstumbler it will display only that
AP - and none else (although there are other APs in the field that I
could manually assign to). 

Any idea? It worked just fine with 4.4-STABLE and no kernel patch
applied. I would try to apply the patch and upgrade to the latest cvs
version but the cvsup-server seems to be unavailable for an unknown
period of time and I wasn't able to locate a mirror.

Any input greatly appreciated!

Regards
Markus