Many thanks, Andrew. That was indeed the problem.
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Since I don't usually need the the JDK, I installed the "recommended" JRE from Oracle, which is still 1.8 (Java 8).
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I removed the JRE and installed JDK 23. Now, YAAC works perfectly on the MacBook Air M2 Sequoia 15.1.1.
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Great support.
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73
Pascal AC7N