The context menu doesn’t appear at all. This includes right-clicking, dragging off of nodes, drop-downs in the Details panel, and the File/Edit menus. This means that Blueprint scripting is completely broken.
Exactly 1 week ago, this wasn’t an issue, but I installed the new Creators update since, and now it’s broken. Note that this doesn’t affect 4.15, but it does affect some earlier versions (4.11 and 4.13, to name a few). This applies to both clean, new projects and the one I was working on last week
[UE 4.11, Windows 10 64-bit Creators update]