Core 1.0.6 for Curie boards (only Arduino/Genuino 101 ATM) has just been released! You can update your existing core via Board Manager
The official changelog is impressive and the tools have been improved too.
For example, the toolchain is now completely targeted to Curie devices (and the specific Intel extensions to ARC core), bringing optimizations and SPEEEEEEED to all your sketches for free ;)
SPI library has been expanded to support the second SPI port routed to the on-board 2MB flash chip, so you can start using it for storage of flash-intensive sketches
From now on, please make sure you are using the latest version before reporting any bug :D