"After Effects warning: effect control converion required in effect''Cineware'' Some effect controls will be reset. To avoid silently resetting these same effect controls on all subsequently loaded projects, save this project and then quit & re-launch After Effects (25::0).
This affected every manual itteration of that file as well as all the autosaves, so I couldn't open a single file from both projects I'd been working on recently. After searching for an answer, I noticed that After Effects had auto-updated so I figured I'd try downgrading to the previous version. That fixed it and I can open my files again so I thought I'd share and hopefully save you from my anxiety filled morning.
Is AE removing support with Cineware in the future now that they are working on their own 3D implimentation?
Sorry for the issue. There was a change made by Maxon to the Cineware plugin that broke compatibility between 24.0 and 24.1. We are working with them on a fix currently and plan to have the issue resolved in 24.2.