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Generally, error happened with network drive. I was working on project in PHP, internet connection crashed and then NetBeans froze, unfroze short after, all projects vanished, including project I worked on. Application restart doesn't load projects again, even when network drive is mounted again, on same mount point. All projects must be loaded manually one by one.
Thanks for reporting but for further investigation we need log file, if IDE freezes we need also thread-dump generated at the time of freeze. Please provide missing information and reopen, thanks in advance.