I am currently using the 4.1 branch of the Unreal source release. And I have run into a slight issue. Nothing that stops me, but is a question. Are there others with issues with compiling when using unions (assuming you have used any)? I have recently attempt to declare a simple union for a class and it stops building and says the declared property is not recognized. I just wanted to not have to waste any memory, but I went with a struct instead. The biggest reason I ask this is because there is a TUnion template in the documentation but when looking at the Core, it says that it is not included because it doesn’t compile. So my real question is, am I going to have to live without unions for UE4 programming?