I have been taking a Arduino class for 3 months. right before the final is due the USB serial connection disappears.
Has any one ever seen their dev/(tty or cu).usb disappear? I restarted the program, the computer, I let the thing rest, I tested Arduino 06 and 07. I reinstalled the USB drivers that came in the install package. I can still see serial, bluetooth, dial up, all the things I don't use (which is probably why they are still there)