Some older versions cannot read the latest disk images. I've been using This depends on the periodicity of the task. That's a very good recommendation. Also, if you already happen to have Quickeys, it provides very good facility for launching scheduled tasks, including applescripts. I would not buy Quickeys for just it's 'cron'-like abilities, but it does bring a lot of other things to the table as well.
Usual disclaimers apply.
I have a Duo 2300c in a Dock Plus, and I'm running Mac OS 8.1. Can't Be Found I ran into this problem, too, although it seemed to crop up after I had loaded a word conversion filter to handle word 97 downgrades. But it was about the time of 8.1 also, if I remember right. If you find out anything, please post.