Update: same failure with core version 2.0.2 released today as reported above with version 1.0.7.
Requires master reset to proceed with upload, then exits with status 74 and throws error; nothing loaded.
Arduino: 1.8.2 (Mac OS X), Board: "Arduino/Genuino 101"
Sketch uses 48732 bytes (31%) of program storage space. Maximum is 155648 bytes.
Forcing reset using 1200bps open/close on port /dev/cu.usbmodem1421
/Users/mike/Library/Arduino15/packages/Intel/tools/arduino101load/2.0.1/arduino101load -dfu=/Users/mike/Library/Arduino15/packages/arduino/tools/dfu-util/0.9.0-arduino1 -bin=/var/folders/lb/f_yllkvc8xj6nf001s72p3qr0000gn/T/arduino_build_849820/Blink.ino.bin -port=/dev/cu.usbmodem1421 -v -ble_fw_str="ATP1BLE00R-1631C4439" -ble_fw_pos=169984 -rtos_fw_str="" -rtos_fw_pos=0 -core=2.0.0
arduino101load 2.0.1 - compiled with go1.7.5
Starting download script...
Serial Port: /dev/cu.usbmodem1421
BIN FILE /var/folders/lb/f_yllkvc8xj6nf001s72p3qr0000gn/T/arduino_build_849820/Blink.ino.bin
Waiting for device...
Device found!
exit status 74
An error occurred while uploading the sketch