1) Click "Profile the IDE" icon in the Performance toolbar to start profiling the IDE.
2) Open some projects, files within them, etc. to create some activity for the profiler.
3) Click the icon again (which is now labelled "Stop IDE Profiling and Take a Snapshot").
This last action should create and open a profiler snapshot, but the "Saving snapshot" progress bar in the status area of NetBeans never goes anywhere and a snapshot is not opened.