I received the MKR1000 as part of the hackster challenge and was able to upload sketches with provided beta libraries. Now that I've upgraded the board library to 1.6.5 it never completes the upload. I have also tried resetting the board during upload. I've tried this on Mac OSx laptop and Windows 10 PC. I've tried both v1.6.7 (on PC) and v1.6.8 (on Mac) of the IDE.
No joy. I was excited to try out the new board for the contest and the beta cloud site, but this stop me cold.
I can provide more detail if necessary.