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Broken links to NBMs from http://www.netbeans.org/updates/dev_1.18_.xml. For example http://www.netbeans.org/download/nbms/dev/main/1.18/java_ide/org-netbeans-modules-java-editor.nbm
I reverted to old dev_1.18_.xml catalog. Now the links should be correct for the catalog.
I regenerated the Dev UC again, problem seems to be solved.