Brilliant @pichalite, thanks for the heads-up.
Whenever I try to spin 0.4.x up, the following error occurs in the log:
[cluster] Spinning up another process... [cluster] Child Process (*) has exited (code: 8)
What could be the problem?
Clustering wasn't available in 0.4.x I don't think. So either you've got newer files on your server than 0.4.x, or 0.4.x has become self aware and is mimicking the newer models.
Too spooky, hasn't Terminator taught us anything?!
I reinstalled in a new directory and that fixed it.