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This is umbrella issue that include all issues that cannot be reproduced in right NB installation. Probably issue related with: - importing previous setting NB settings.
Probably root cause of issues is missing equals and hashCode methods in the LibraryKey. This issue was fixed in change set: http://hg.netbeans.org/main/rev/2aca78f5502c
Investigation show that there are no common root causes for issues 196223 196225