Console.log seems to indicate that it stops in the midst of loading Add-Ons for the server--it just stops at any random point. I can post it if anyone seems concerned.
Okay so here's what I've been doing:
1. On a MacBookPro, running Mavericks 10.9X.
2. Run Blockland through Steam.
3. Start a Game.
4. Go through normal startup selections, no problems. I am definitely under the datablock limit as I have minimal Add-Ons enabled for the server launch.
5. Server loading screen shows up.
a. If Singleplayer, nothing pops up.
b. If Online Game, a dialogue box sows up up saying that Blockland needs to accept online permissions. Select "Accept", and loading continues.*
6. Loading bar continues through "Loading Add-Ons" and sometimes "Loading Music."
7. Some time during those loads, Blockland crashes and shuts down.
*Note I already allowed this in the Security Preferences for both Steam and Blockland.