Error: "-1.#.ND" ? What?

[palistov]

Performance shouldn't be an issue either way. Computers are very fast. When you take things to the extreme is when performance starts to suffer. So if you're placing like 10k of these rocks to try and create a cave or something, that's when performance starts to matter.

But yeah, the player instantly dying because of a bizarre physics interaction is a big issue D:
Using the static should resolve your issue, I've never died from walking over a rock before