Go to C:/Program Files/Blockland (or wherever you installed it)
Go to Add-Ons, delete the files of the last two or three Add-Ons you installed
Go to Add-Ons/client, delete the files of the last two or three Add-Ons you installed
Start Blockland
Go to Options
Go to Controls
Click "Defaults >>"
Choose settings
Start a server, join servers, etc and test it
If it works, yay [End]
If it doesn't, close Blockland
Go to C:/Program Files/Blockland (or wherever you installed it)
Get the file "console.log"
Attach it to a post here