I'm aware that when overloaded, Logic will load only necessary plugins, however, when working properly, you should be able to engage those plugins by clicking on them.
In this case I am not able to engage any third party plugins.
I have only experienced this after purchasing some Waves plugins. I've done a whole lot of work that I will lose (and created sounds I will lose) if I can't get this working properly.
I've been able to briefly get things working again by uninstalling the Waves plugins and re-installing them - but only briefly.
It's never been a problem while adding the plugins and working with them. Only after closing the project. Things freeze up when trying to open the project again, and eventually it will load with all the third party plugins greyed out.
It's been suggested that some plugins might clash. If that were the case, I'd guess it was Waves clashing with Soundtoys plugins.
I haven't been able to intentionally recreate this by starting a new project. It's only happened on a couple projects after they get fairly involved.
Any shlep would be greatly appreciated.