I was having a helluva time getting client mode to work on my new Mark V. No matter what I did, wlan1 would not light up red and show me that it was trying to do anything. In fact, it would turn off after I enabled it and tried to connect in client mode. (soooo frustrating on something that should be so easy, right?)
I spent a good bit of time reading through the forums and saw many topics dealing with similar issues. Some of the fixes talked about doing factory resets or forcing a fix of your wireless settings through ssh. I tried all of the above many times ;) They all had the same effect: No fixy fixy :(
Eventually I noticed something odd in my /etc/config/wireless. I have a network that has a plus sign (+) in the SSID. /etc/config/wireless listed a space in the place where the + should be. On a hunch, I manually edited the file and replaced the space with the +. I rebooted the Mark V and voila! I had internet! :) For the first time since I received the device, I could finally connect to the outside world!
Anyway, I was pretty happy. Even though the SSID scan listed the network correctly, apparently there was a problem parsing that character and writing the file. I will make sure to post this in the client connection problem thread I saw earlier. Hopefully this can help someone else out that is banging their head against the wall/keyboard/pet/whatever.
Alarial