Somewhere along the way while adding UMG support for both c++ and blueprint in 4.9, the uproject file is update with a “UMGEditor” dependency in it.
This happend to break the Development Configuration Build in VS.
Removing “UMGEditor” in the uproject file fixes it.
It took me quiet some hours to find this out and I am pretty sure whatever automatically adds “UMG” and “UMGEditor” to the uproject file should only add “UMG”. Maybe this bug is already gone in 4.10, but didn’t saw it mentioned anywhere.