There was a bug in the previous 1.9.0 version which created backup yml files for 4 configuration files and used those files for the server.
This update resolves that issue and uses the old yml files.

• config.yml
• mobs.yml
• messages.yml
• items_back.yml

I apologize for the inconvenience

I also fixed the following bugs:

• Mobs dropping items in worlds where the drop enabled values were false
• Fixed issue that overwrote custom drops of a mob when using the /mk addCustomDrops command. Multiple drops still worked before, but only if you set multiple directly in the mobs.yml file and reloaded