Hi,
You can check -
1. Open the plugin in a new Pro Tools song/ project. You seem to have tested in old projects only.
2. Try the plugin in a new song/ project in another DAW if possible.
If the plugin work in both the above cases, then it look like it's about your old ProTools project.
If the plugin work in case 2 but not in case 1, then it look like a problem between your ProTools and the plugin.
If the plugin does'nt work in both the above two cases, then it just tell the issue excist with other DAWs. I use the VST2 version in Studio One 3 PRO on Windows 10, and that work.
As your other Arturia plugins work in your projetcs, then it's probably not about the OS or the plugin version you use itself, if they are the same version.
In all cases you can be sure, that your OS and your DAW also is updated like you plugin.
If you can load other Arturia plugins, then it does'nt look like RAM issues, but you can check - just in case.
Beside this - you can contact Arturia support. It can very well be a bug.