Hello,
Project in what?
Which OS?
Which Plugin format?
Do you have any issues in Standalone mode?
You don't give much informations.
The plugin informations for ie a DAW project is stored by the DAW, when you save the project. So in a case like this, then somehow the informations is'nt the same, - or the plugins for some reason does'nt react to the informations,- or something on your system has changed that can cause this issue.
You can try to download and install an earlier version of a Arturia plugin from the download pages archives, and see if that make a difference. If not, then it's perhaps about something else that the plugins.
Keep in mind, that this forum is'nt the same as contacting Arturia support.
Good luck