It's not the correct driver. Did you check your
kernel message buffer for any oddities?
Open a terminal and type sudo dmesg
You'll be asked for the admin password
then when you press return you will see a list
of all the kernel messages since your last reboot.
I suggest a reboot before you do the dmesg. The
list will give all your devices loading at start and errors
along the way.

Also I have a suggestion. And this is my own feeling
and no way shared by any Chirp team member.

Please do not use iPhones, tablets, Android phones
etc...to reply to your Chirp Users mail. None of them
seem to format the replies into an understandable
method to determine the timeline of replies. So I don't
really know who the heck I'm replying to I can only guess.

I'm about ready to ban these portable devices in the Yahoo
groups I own. They do not quote properly or at all. iPhone
is the worst. Just my 2 cents worth.

Milton