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Reproducible at will following these steps: NB8 beta: export settings to a file NB8 rc1: import settings from a file - hit OK, Netbeans crashes.
I am sorry but I cannot reproduce in NetBeans IDE 8.0 (Build 201403101706). Please try the latest build, not beta/rc, and reopen if it still happens for you, attaching at least the log file. Thank you for reporting.