John,
Have you tried various values for the number of seconds? Also, it seems to me
that I read somewhere (probably in the Compute Publications book Advanced
AmigaBASIC) that there are some problems with the event-driven commands, such
as ON TIMER — at least with v. 1.1. I loaned out my copy of this book, so I
can't tell you for sure!
Does anyone else know of a bug with ON TIMER?
Good luck,
Gary