I'd stick with latest 15.X version. I assume you don't have an Ultimaker printer - just the printrbot. Have you tried other nozzle sizes on your printrbot by the way? .6 prints real fast and .25 prints real fine.
I just flashed a new board using 15.x on one of my UM2s, I had to reset and re-hook the printer a few times before it saw it. I am not sure why, but it did take a few tries. Same spot as you, I run that machine tethered to a metal plus every day, but it just took a few attempts before it saw and updated the Ultimaker.
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Swissengineer 25
Try these:
- reseting the printer
- reseting computer
- changing the USB port
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