The Mac version is a bit unstable, I always find myself crashing or freezing for a few seconds because someone joined or I put laser a emitter.
I don't mean to complain, though. Could it be I have too many add-ons? Maybe just too many broken ones? I have no idea.
But yeah, I always seem to be crashing because I use a script or something. (e.g i used a tumble on command script, and i crashed.) of course, tumble has always been instable, so i removed it, but i've still been crashing every five seconds. I'll post a console.log next time I crash, because I think the log resets if you start up blockland again and shortly after crashing my first instinct was to start blockland up again. :P