I am having an issue with Visual Studio Pro 2017 not saving the SDK, NDK or Java paths when I update them in Tools -> Options -> Xamarin -> Android Settings. I also have community edition loaded, and they get saved correctly there.
I have changed them in the following registry key, but when go back into VS, they are changed back:
"[HKEY_CURRENT_USER\Software\Xamarin\VisualStudio\15.0_91fab84c\Android]"