[Obsidian Dragon]

My first guess is that you may have a plugin that is not compatible with either the OS or the version of Protools you are running. MacOS 11.6 is relative new and not all plugins are updated for it yet. Likewise Protools 2021.7 has only been out about 3 months and so some plugins are not updated for it yet. Check with the plugin manufacturers to see if they have an updated version available. Otherwise you may have to do without that plugin (or use a similar plugin) for now.