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In the case two different release re-using the same userdir which contains 'netbeans.dirs' which points to other installation, NetBeans IDE doesn't start.
core-main/rev/a53fc85c03e6
Integrated into 'main-golden', will be available in build *201203071105* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-golden/rev/a53fc85c03e6 User: Jiri Rechtacek <jrechtacek@netbeans.org> Log: #209184: Load wrong clusters in some circumstances