AC sees no WLAN, but networkstumbler does

[jjsprengel]

HI Folks,

since a while my T61P won´t recognize existing WLANs. What started sporadically turned into a constant "no wireless network found" situation.

However, networkstumbler at the same time identifies WLANS reliably. In the meantime I have upgraded network driver, Access Connections, and yes, I consulted the AC FAQ.
Antivirus and firewall were disabled with no effect and I´m not aware of any upgrades which coincide.

I suspect some process in the network stack blocks higher level access, whereas network stumbler calls low level procedures, and hence is not affected.

I don´t know, where to look anymore.

Any ideas?

Thanks,
cheers,

Jörg