Arduino UNO and osx

For the ones that seem to have issues, from prefrences,network prefrences, remove the arduino uno device that is shown(minus button) and apply. Plug it back in and wait about 20 seconds, then attempt downloading a sketch..Should work fine now...

Is this a solution? I think I have tried it and it didnt work but I will attempt it again when I get home

tried it and still the same problem. thanks for tryin

I just got a new Uno and was having the same issues on my iMac. I was using a USB hub through my dell monitor. I then plugged directly in to my iMac and it started working. So anyone having issues, try direct USB ports.