I have one issue, or two issues, depending on perspective. First, WebGL isn't building and playing Vimeo videos from the Vimeo SDK in 2017.3, but some Vimeo SDK users are saying that it just doesn't work in that version, which I believe is the case. The main thing now, while upgrading a project in working order from 2017.3 to any newer version, it loses reference to the Vimeo namespace from the Vimeo SDK. When adding the reference back in inside Visual Studio, it causes all the "namespace not found" errors to go away, and it builds. When inside Unity, the "namespace not found" errors persist. If I save the scene, close, and reopen Unity, the errors come back inside Visual Studio automatically - it dereferenced the Vimeo namespace again, despite the cs files and csproj being in the same place. Is there a solution to this? I was not expecting this kind of behaviour.