thats because we push them under the bed and forget them
I am under no bed. Also deathrider stop being completely the opposite of helpful. This is how mac vs pc wars start and the person asking for help never gets their help. Arctichenry what operation system version do you have? Leopard, Snow Leopard, Lion, Mountain Lion? If its anything Tiger or earlier that may be part of your problem. Also do you have any parental controls on your account/computer enabled? Some settings on there can instantaneously kill some connections.
Is your firewall on? This shouldn't crash your server, but it still can effect your ability to host.
Are your ports forwarded? You shouldn't need to forward ports for Blockland anymore and this very likely isn't was causing you problems but it can help having them forwarded.
Lastly do you get any pop-ups when it crashes? Sqlite errors, Syntax errors, bus error, Segmentation fault or maybe others?
Does your computer realize the crash? (does the reopen window pop up)