Mac OS 10.7.4 Arduino 1.0.1 Processing 1.5.1 Nano Have successfully uploaded programs in the past. status: newbie I am able to upload sketches via one usb port but not the other. I was able to use both previously. I have confirmed that I'm switching to the proper serial ports when attempting t…

Cannot upload programs thru one usb port but can through the other usb port

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