After downloading the jum CVS build of LW and getting the same bounce and crash, I figured that my Java 1.4.1 installation might be incomplete, even though I had downloaded the installer from Apple's web site. So, I removed the version.plist file per the instructions below, and reinstalled Java. Finally, LW worked!

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Repairing an Incomplete Java Installation:

The problem can be corrected with a manual fix requiring an administrator-level account.

From the Finder, navigate to /System/Library/Frameworks/JavaVM.framework/Resources/ and open the folder.

Move the version.plist file to the Trash. An authentication dialog may appear. Enter an administrator username and password.

Confirm that the version.plist is no longer in /System/Library/Frameworks/JavaVM.framework/Resources/.

Download the complete Java package from Apple's web site (not a software update)

Follow the instructions of the installer.

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LW jum starts and runs OK, though it resists my efforts when I try closing the LW window. I can live with that....

My question now is, do I dare try to update to the 1.4.2 Update 2 version of Java, or should I just leave well enough alone?

Thank you for all your help.