Thanks, I didn't know that! :)
Anyway, that aside, it is frozen again…
I've done a brand new install, new VM - I leave it idle after installing and so it is at the first screen where it says "Do you want to set up VLANs now [y|n]?", and, I just left it.
I came back a few minutes later and the machine is just frozen.
Does anyone know why? This is just a standard new ESX 5.5 VM on freebsd 64 base / 1 core / 1GB memory / 8GB hard drive. I can't think of anything out of the ordinary.