Hi,
The Arduino IDE package adding support for the Arduino 101 causes problems. In particular, it bundles a copy of the Adafruit NeoPixel library. This version is not the same that is downloadable in Libraries, and having two of them causes problems.
in particular, starting wiht Arduino 1.6.7, install the Adafruit NeoPixel library via the Libraries->Manage Library feature.
Then, install the Intel package support for Arduino 101. This installs a different version of Adafruit Neopixel to the intel-specific dir.
Then, Arduino 1.6.7 says you have an out of date library that prompts you to update the Neopixel library. After you do this, it seems like the Arduino 101 can't use that library, so you have to manually install/deinstall the various versions when switching between Arduino 101 and Uno.
If necessary I can provide the exact set of steps that causes pain. But it seems like the Intel-specific Neopixel library should just be upstreamed to the Adafruit Neopixel library, and then have that download via Manage Libraries in the IDE.