MadProgrammer

Here is the module configuration that is causing the problem: @PART[SYtank5m3mAdapter]:NEEDS[TweakScale] // 5m-3.75m fueled adapter { MODULE { name = TweakScale type = adapter_4_3 defaultScale = 5.0 } } @PART[SYtank5m*]:NEEDS[TweakScale] // 5m short fuel tank { MODULE { name = TweakScale type = stack defaultScale = 5.0 } } SYtank5m* matches the following parts: SYtank5m3mAdapter SYtank5mCone2 SYtank5mL0188 SYtank5mL0375 SYtank5mL0750 SYtank5mL1125 SYtank5mL1500 The easiest solution would then be to replace SYtank5m* with SYtank5mL*|tank5mCone2 to match everything but the adapter.

The latest release includes my fix: https://github.com/MagicSmokeIndustries/InfernalRobotics/releases

It appears that the custom category broke because the parent category name changed in KSP version 1.3. It used to be "Filter by Function" (as seen in EditorCategory.cs) but is now "Filter by function" (note the lower case "f"). I'm not sure why it would have changed, since this is the name used internally, not the localized name. Fixing the name and rebuilding Infernal Robotics made the custom category work for me.