Since I updated Xamarin I cannot get it to find System.Core even though I have tried removing and re-adding it to references.
So I removed all references to it and the project builds but I am getting a new issue on some devices which I am wondering if it is something to do with this.
I saw someone on SO had this problem but their fix didn't seem clear and I was unable to get it to work. Reason I am posting here instead of in the SO thread is I feel like this must be an upgrade issue others have come across! It seems so simple but it just isn't working!