Connect IQ SDK 4.0 Preview 1 - BufferedBitmaps -> Error: Symbol Not Found Error

Hi, is there any breaking change in the interface of BufferedBitmaps?

...simply compiled my watch face app and started the simulator and sadly get this exception:

Error: Symbol Not Found Error
Details: Failed invoking <symbol>
Stack:
- createBufferedBitmaps() at ...

The code simply creates a bufferedBitmap using the default interface:

dummy = new Gfx.BufferedBitmap({:width=>10, :height=>10, :palette=>[color0, color1, color2, color3]});