>                         SDL_LockSurface(m_screen);
> 			SDL_BlitSurface(m_display, &m_update_rect, 
> m_screen, &m_update_rect);
>                         SDL_UnlockSurface(m_screen);
> 			SDL_UpdateRect(m_screen, m_update_rect.x, 
> m_update_rect.y, m_update_rect.w, m_update_rect.h);

	Maybe the following will be better (for a quick test only -- best is
to properly deal with surface locking in all cases):

if (SDL_LockSurface(m_screen) == 0) {
   SDL_BlitSurface(m_display, &m_update_rect, m_screen, &m_update_rect);
   SDL_UpdateRect(m_screen, m_update_rect.x, m_update_rect.y, m_update_rect.w,
m_update_rect.h);
   SDL_UnlockSurface(m_screen);
}

	Thanks for doing those tests  :)
	- NC

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