I have never ever been able to crack WEP ad-hoc networks. Ever. It always show “Waiting for beacon frame” and then “No such BSSID available”. However, it works fine with WEP infrastructure networks. I've been through different versions of Cleven (and kernel) but it never worked for me. I don't know if it's an issue of Cleven or aircrack-ng. Apparently somehow aircrack-ng/Cleven didn't get the right BSSID (or at least it's what google tells me).

It's not that my installation is broken. I just did a reflash some days ago and reinstall the latest version.

Anyone succesfully cracked a WEP ad-hoc network?