Beta Rev 3.0- dfu device not detected Mac OS 10.9.5

[LariSan]

I'm trying to use your Beta version 3.0 of your Firmware updater on my mac. (I couldn't find where to post my question on PXT user page on the Printrbot Wiki: http://www.printrbottalk.com/wiki/index.php?title=User:PxT
The previous version that was released Jan 2014 the USB works fine, but on my simple Metal there appears to be an issue with the auto leveling probe/ z-axis... so I wanted to try the Beta 3.0, but can't get past the USB driver.

Not sure if anyone else has had this, but there may be an issue with the MacOS USB on 10.9.5

[PxT]

I'm not sure what you mean by "can't get past the USB driver". Can you be more specific about the issue you are running in to? Please attach a screenshot with the error or copy/paste the text.