Hello,
OS X will not work with 8.6 as the Classic agent. Sorry about that. You need to be running 9.x to have it function properly.
Now, the larger question that I have is what version of 9 are you working with? In the day I was working with OS 9.x I would rarely have a problem. Make sure you are running with the latest 9.1 or later if you can. I do not remember what the last, final 9 version was. I do know that you do not want 9.0
Now, there is nothing wrong with working with 8.6 for the rest of your days. Granted it will not work on the latest hardware, but if you can keep an older Mac working, go for it. There is nothing wrong using two machines if you have a solid investment in a legacy solution.
Christian
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Posting Virtuoso
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since Mar 2004