<A target="_blank" href="http://www.davehay.f2s.com/2010/02/interesting-problem-with-sametime.html">Dave Hay re-installed Notes 8.5.1 FP1 on his Macbook, then started getting errors</A>. He found an article saying the problem has to do with updating Java, so he's posted links to what he found, and hopes he's fixed the problem.