I'm having this problem also. I just upgraded to 10.04 from 9.10 through System Update, i386 version on a Toshiba Satellite using an Atheros card. In my case, cutting wireless off manually does successfully work, but attempting to cut it back on from the switch fails. Additionally, using rfkill unblock doesn't work. 9.10 didn't have this issue for me, so I'd wager this is a 10.04 issue with the BIOS, if anything.
I'm having this problem also. I just upgraded to 10.04 from 9.10 through System Update, i386 version on a Toshiba Satellite using an Atheros card. In my case, cutting wireless off manually does successfully work, but attempting to cut it back on from the switch fails. Additionally, using rfkill unblock doesn't work. 9.10 didn't have this issue for me, so I'd wager this is a 10.04 issue with the BIOS, if anything.
Just my two cents.