No networks shown at all when using wash

[GoogleCodeExporter]

0. What version of Reaver are you using?  (Only defects against the latest
version will be considered.)
1.4(-2)

1. What operating system are you using (Linux is the only supported OS)?
Ubuntu 14.10.

2. Is your wireless card in monitor mode (yes/no)?
Yes.

3. What is the signal strength of the Access Point you are trying to crack?
N/A.

4. What is the manufacturer and model # of the device you are trying to
crack?
N/A.

5. What is the entire command line string you are supplying to reaver?
wash -i mon0

6. Please describe what you think the issue is.
When I run wash to scan for networks with WPS enabled, it doesn't show any 
networks. It simply stops printing anything after the 'header'.

From a freshly booted computer I stop all processes in advance which airmon-ng 
reports as troublesome (and bring wlan0 up, since stopping NetworkManager 
brings it down). I then turn wlan0 into monitoring mode and starts wash on that 
newly created interface. Nothing else, no mac spoofing or whatsoever. 

7. Paste the output from [wash] below.
Wash v1.4 WiFi Protected Setup Scan Tool
Copyright (c) 2011, Tactical Network Solutions, Craig Heffner 
<[email protected]>

BSSID                  Channel       RSSI       WPS Version       WPS Locked    
    ESSID
--------------------------------------------------------------------------------
-------------------------------



tcpdump: 
https://mega.co.nz/#!zBQTUaDR!4wJ3KUOAY6YzX9rn09XTvq3WEj16_D8XYE_3ukc3kG4

Original issue reported on code.google.com by [email protected] on 12 Feb 2015 at 10:01