wifi shield ->Scan Networks ->0 networks?

Just tryin to set up a basic UDP connection between my laptop and my Uno with orginal wifi shield. I got the shield updated after some hassle and it now runs the 1.1.0 firmware so that seems allright.
Trying to see if the shield finds networks it result 0 found networks with the 'scanNetworks' program.
It gives:
MAC: 78:C4:E:2:32:7F
Scanning available networks...
** Scan Networks **
number of available networks:0

Tried it on two different locations (home and work) where wifi signal is good.
Apperently I am doing something wrong. The jumper is removed. So that's not the problem.
Who knows a solution?