QT is used by the API which requires and calls the CAD when run.
>>>Python API overview – Ansys Optics
We do not know how other application affect our software since we do not use thirdparty utilities. But based on your information on what this software does, it might affect our application. You can disable this software before running the API script as this is not require by our tools.
Or you can hide the CAD/GUI on your lumapi script.
>>>Session management – Python API – Ansys Optics