I recently upgraded from SF15 to the latest, version 16. After upgrading, Izotope plugins would not work. It threw an error saying the plugin may not have been installed correctly. I re-downloaded and installed/activated the two Izotope suites that come with SF (RX8, and Ozone 9 ELements). At least now the Izotope plugins load, however the one I tried, "Declick" doesn't so much as declick, as simply delete the selected audio. It does the exact same thing as hitting the delete key.
Aside from that showstopper, he ability to organize plugins has also now been removed? In SF15 when you click on the "FX Favorites" menu, the first item is "organize". That option is missing in SF16. All in all, not very happy with paying for this "upgrade" and I have gone back to version 15. If no solution is found here, I'll just uninstall 16, write it off as a bad choice and NEVER upgrade Soundforge again.