No access point displayed during scanning

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Launching fern-wifi-cracker in root
2. Selecting wlan0 as the scanning interface. ( confirmation that mon0 have 
been created )
3. launching the scan, no access points appears in WEP and WPA list

What is the expected output? What do you see instead?

Normally some APs appears in the WEP and WPA list. Instead it shows O ap.

What version of the product are you using? On what operating system?

Fern   : v1.8
Python : 2.7.3 default
Aircrack : Aircrack-ng 1.1
Qt version : 4.9.3
OS : Linux kali 3.7-trunk-686-pae #1 SMP Debian 3.7.2-0+kali6 i686 GNU/Linux

Please provide any additional information below.

Normally some APs appears in the WEP and WPA list. Instead there it shows O ap.

In a "CLI" way of scanning i can see a list of more or less 10 actives APs 
around me.
Steps :
- Launching monitor mode : airmon-ng start wlan0 ( it creates a new monitoring 
interface called mon0 )
- Launching the scan : airodump-ng -i mon 0
- In the new terminal i can see 10 actives APs.

Original issue reported on code.google.com by fans.aga...@gmail.com on 6 May 2013 at 5:02

[GoogleCodeExporter]

During scan fern usually ignore AP's with an open authentication (without 
encryption), are you sure the AP's are WEP or WPA protected?

Original comment by savioboy...@gmail.com on 7 May 2013 at 7:39