No no no! The cause of hidden vertexes is accidental pressing of shortcut Alt+I while you are in subobject vertex level. The solution is simple: go to that level again and just press Alt+U. It is max's feature. When you are on subobj level you can hide (and show) unselected vertexes/faces/objects. Have a nice day friends!
I'm having a similar problem, but I can't even select the vertices by clicking and dragging where they should be. Oddly, I get one vertex that shows up and allows me to select it. I know the other vertices are there because I can select all the faces and then go to vertex mode, but that doesn't help when trying to modify…
This thread popped up in google, only Gauranga's solution worked for me, go to vertex mode and press Left Alt + U. Seems to be a feature indeed, not a bug (although I don't recall pressing Alt + I, but I was hiding/unhiding polys).
I have no idea what causes it, but I know how to fix it (most of the time) Select your object, go into Vertex mode, and hit "unhide all" like you would with polies. WHY you can hide vertices, I don't understand.
I had a problem with vertices not showing up whenever I tried to go into vertex mode on an editable poly. It would show on other objects, but not on this one. So I exported the object as a .obj, imported it back into the project, and then vertices were showing up correctly.
It happens to me sometimes, it seems like it's resetting the vertex draw size (default is 4 pixels or something), it seems to go back to 1px because I can still sometimes see the verts glittering in and out of view under the wireframe. The way I always seem to be able to fix this is by selecting all vertices then go to…