FL to FLStudio 12, and with it, "IL Harmor" changed its name to "Harmor". I did this also after performing a clean install of Windows 10 - which also meant reinstalling plugins (including Harmor). That means ...
FL and Hardcore several times, changing settings, deleting and changing channels, etc etc.
If I turn Hardcore off, the playback has no issues. But even still FL will manage to freeze up or crash upon closing or do something else ...