Any Trusted CA problem

Hi, I run freeradius 1.0.5 with PEAP/MS-CHAPv2 authentication through the users file. I got a problem with the "Any Trusted CA" part on some of my clients. Some of the clients can't uncheck that option in the driver and then they won't be able to use the WLAN, because it tries to contact a CA. Is there any way around this problem? Regards, Torkel