MotionFit SDK - endless drift

Hello,

I just received 3 MotionFit SDK with MPU 9150.

When I turn it on, I'm waiting for the blue led to turn off, which doesn't seem to happen, even after 20 minutes. The board is (of course) resting on a table that doesn't move.

When launching the teapot demo, the teapot is endlessly turning around an axis. When rotating the board slighly around its Z axis (which is in the opposite direction of gravity), the tapot experiences a stable change in its "endless turning" axis, but continues to turn around.
Both blue and red leds are blinking endlessly.

I suspect the gyros don't calibrate, but don't know why.
The problem is the same with the 3 kits.

The devkit's board is blue, the hardware is slightly different from the green board in the Quick Start Guide 1.2. figure 4.1.0(different JTAG hole layout for example).
On my boards there's a "MotionFit SDK, rev. B, Mar 01 2012.

What can I do to get a stable output from those kits?

Thanks