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