http://blockland.us/index.asp?p=FAQ#sQ: Blockland suddenly started crashing after working fine.
A:
Blockland is a computer program, it does not wear out or spontaneously stop working. 99% of all Blockland crashes are caused by user tampering. Most likely, you have installed or created a defective add-on which interferes with the operation of the game.
Remove any add-ons you have recently installed.
If this fails, re-install the game and choose not to keep your old add-ons when the installer asks you.
Basically, this means you installed an Add-On that makes something in the game break and then the game crashes because of that Add-On.
Hopefully this will clear out the Help forum for more serious problems.