Which version of Max are you using ? Or it might help posting the file or open it on another Max workstation. Just in case something in your Max installation got wonky ...
The newer versions of Max are prone to Stack Corruption, 2011 and lower shouldn't have this problem unless you imported a mesh through an an already compiled model in an iffy format. Other then that however, the newer versions do stack this issue pretty quickly.
Just encountered something that seems to have swalled my last 30 mins or so of fiddling.. but oddly enough the problem persists even when I open backup versions of the file from my cloud storage. Everything went wrong when I hit undo after making a mistake I do not remember. I can't exactly give a 'before' image, but…
Even though you already tried restarting max. I have sometimes have this problem when I walk away, or go to my desktop. Then I go back and it's like a lot of vertexes got extruded. Then I simply restart the program and it goes away. This looks like the same thing. But hey, some weird stuff happens so it might be a complete…
It could be one of two things (or maybe more...). 1) You made some edits lower in the stack that affected the upper modifiers. Everything in the modifier stack is dependant on what is lower, make changes to the foundation such as adding or removing geometry and things can get dicey up the stack. Every vert gets a number,…