I get some off graphical glitches which I don't fully understand. Sort of a bits of creatures flying everywhere: will see joints (red dots) and bones schizophrenically whirling all over the screen. Since these pieces are detached from one another, despite all parts of the creature being connected, I assume it is a graphical glitch and not a simulation problem. Indeed, the simulation seems to carry on fairly normally as creatures will usually evolve past whatever behavior was causing the issue … with later generations behaving and displaying normally.
Here's a representative screencap: