Actually I had the verbose output enabled for both compiling and uploading from the very start. I tried turning it off and it still failed to get though the verify phase. Once in a blue moon it DID manage to compete the upload (Blink example) and it didn't matter if verbose was on or off. I'd say out of several dozen attempts the upload completed perhaps three times. Even when it doesn't complete if I exit the IDE closing ALL windows and then reset the hardware the script runs fine.