Hi,
This is a simple plugin that sets players to visible... if they are invisible.
Source code:
Code
Install instructions: download the MRForceVisible.jar file. Create a folder in your plugins folder called MRForceVisible and place the MRForceVisible.jar file inside this folder. (Plugins folder should be inside your \RisingWorldDedicatedServer\ folder. If it's not there you will need to create a new folder and rename it plugins).