Bitmap manipulation while in a thread

Creating a new CFbsBitmapDevice from a bitmap seems to always crash when done from a thread (a RThread to be specific).  In addition if I create the device and then pass it to the thread, it will crash my app when any calls are made.  My code works fine when done from the main thread created by the app.  My goal is to bitblt copy a picture acquired from the camera by my thread to a CFbsBitmap instance in the main process, so it can update the screen.  Is there something I'm missing?