Nope, definitely don't and still trying to make it work. I opened up goblins-mesh to potentially help illustrate the problem. Moving the vertices does nothing but I can still key the mesh. When I do however, it comes out only as a ghosted image of what the frame would have been (for some reason it's treating it in reverse, and also treating it as though I never keyed?)
not sure if this image will help at all but worth a shot to show what's going on :[
edit: I should have mentioned before, but I have ghosting turned on for current frame only
edit2: further testing is showing that, within the animator view (and not animating) the ghosting is showing what will actually happen within the animation, but as you can see in that image in the animator view there is actually no mesh deformation happening for me (hence why we see the current frame ghost at all on spots like the ears)