Is this using an editor you’ve built yourself, or using one that you installed?
Currently building the editor yourself with VS Express results in the code navigation features being stubbed out (this is fixed and will be available in the next update), however they should be working in our installed versions since these are built with VS Pro.
Has this been solved? Because I just downloaded and compiled 4.5.1 on my computer and when trying to open VS from the editor it’s giving same message as OP