
Verify you have a 3D model loaded in Cura.On WIndows you launch the Cura program and in the upper lefthand corner of Cura it will say Cura - 15.04.6 In the version section you should see 15.04.6.
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You can do this on the Mac by going to your applications folder, finding Cura, selecting it and choosing "Get Info" from the File menu. Verify you are running the Cura 1.5 (15.04.06 version) and not the 2.x versions.Have you UNPLUGGED all the other USB cables from your computer except for what is absolutely required (like a USB keyboard and mouse for some desktop users).Have you tried another USB cable? Sometimes a broken USB cable is the issue.Both should work, but eliminating USB 3 and USB hubs can help us isolate the problem for this USB 2 device. If your computer has both the older USB 2.0 ports and USB 3.0 ports (blue interior) plug it into the USB 2 port.Is the Type A USB 2.0 Male end of the USB cable plugged directly into your computer?.
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There are several different designs on Thingiverse. You may want to add a 3D printed USB cable support block to help take the weight of the cable off the USB connector. The design of the Micro USB connector is prone to failure.The reason why the USB cable feels like it is upside down is because the printrboard is mounted upside down for ease of access. The slightly smaller rounded side goes towards the Printrboard while the longer side with the 2 mini cut outs for the holding pin to help hold your cable are pointed towards you. This is a PAIN to do so look carefully while you have your Printrbot knocked over as you pull out and reinsert the Micro USB cable into the USB port on the Printrboard.

