I found an issue with Chatterer 0.7.1 on KSP 0.25 (Linux, 64 bit) where selecting a different skin for its windows will work fine until restarting the game. After that KSP.log will be spammed with [EXC 14:35:42.006] ArgumentOutOfRangeException: Argument is out of range. Parameter name: index System.Collections.Generic.List`1[UnityEngine.GUISkin].get_Item (Int32 index) Chatterer.chatterer.draw_GUI () RenderingManager.OnGUI () and a lot of dialogs won't show while flying a mission, including stock things like the science pop-ups. I was able to fix it by setting skin_index = 1 in GameData/Chatterer/Plugins/PluginData/Chatterer/plugin.cfg