I made a mistake in the 0.2.0 release by defining the start/stop generic functions, because I only had the timer class in mind, when there is already a protocol for this behavior, and that is the enable generic function. So instead of (gfw:start timer) we should instead call (gfw:enable timer t) and likewise instead of (gfw:stop timer) we should call (gfw:enable timer nil) I will check in this change in the near future. -- Jack Unrue