The first profile that was logged on and connected worked fine, but if that user remained logged on and I switched to another user then the second user could not connect.
So after battling with this for a month I finally managed to find a work-around, which I will share here in the hope that it reduces frustration amongst other long suffering souls.
1) Log into your routers configuration page something like http://192.168.1.1/
2) Navigate to the wireless security settings
3) Set the security mode to WEP
3.1) Be aware or the security risks : http://www.home-wlan.com/WEP-vs-WPA.html
4) Generate or enter keys, and remember which key is set as the active key.
5) Save settings.
6) Remove your old wireless connection profile.
7) Add a new wireless connection profile using the WEP key from above.
8) Check connectivity
9) Fast user switch to another profile
10) Repeat steps 6), 7), 8) & 9) until all profiles are working.
I saw this question asked on google answers without an answer:
