I have an automatic build process that uses the iscmdbld command-line (ISWI 2.03) program to build the installs. All of a sudden, I am getting "** Error 53: Invalid custom action type" on all by builds (and some of them don't even have custom actions!

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I think the most likely culprit is Visual Studio .NET, since I just installed it. But I need to get around the problem...
Any ideas?