Modifying standard schematic symbols?

[Rene_Poschl]

in kicad version 4 you need to either name your symbol uniquely with respect to all libs or take care of library priorities.

Any conflict with names of modules and libraries?

yes The following rules apply though: For symbols: A symbol needs to have a unique name over all symbol libraries. If you have two symbols with the same name in the same library, kicad will complain. If you have two symbols with the same name in different libs, kicad will use the one from the lib with the highest priority. (The priority is determined from the position of the library in the component lib dialog. See screenshot.) Something similar applies to symbol library names and directori…

This problem has also been noticed by the library team. Indicate on the schematic symbol the physical motion of a potentiometer · Issue #165 · KiCad/kicad-symbols · GitHub