stellios:
Is there a way I can compare USB drivers with anyone? I don't actually know the terminal command to be able to look mine up. Maybe also comparing hardware via the system profiler?
The "drivers" for the Uno are built into OSX and not something that gets updates often (if ever) anymore.
One step you could try is to turn on verbose output in the Preferences so you can see the command lines being executed. Maybe avrdude is causing the problem? You could see where the files are located and the avrdude command line and try running it manually.