I am using CC 2017, but it has been an issue for multiple versions.

I have a custom plugin that implements INumberConverter on kPageNumberingStylesService Boss for a custom numbering format. This works beautifully until I try to export to PDF. If I print to PDF Distiller it works fine, but when I export to PDF it exports with default numbering style.

This is similar to an old stubborn bug, when exporting book to PDF would not do the numbering correctly. I don't know that it is related, but they both seem to say that the numbering on export is decoupled from the way it is calculated for regular viewing of the PDF.

Function GetEnableGPUPerformance() of interface IGPUPerformancePrefs of GetExecutionContextSession()->QueryWorkspace() returns true in case no GPU or a not supported GPU is installed on your macOS computer.

To reproduce launch InDesign CC 2018 or later with modifier keys command, option, control, and shift pressed and confirm resetting the preferences.

If you now check the setting either with some C++ code, or ExtendScript "app.gpuPerformancePreferences.enableGpuPerformance", in both cases the returned result is true , which is not the expected result.

When you now choose Preferences > GPU Performance the properties are shown deselected and disabled, which is correct. If you now click in "OK", the above function call now correctly returns false. After quitting and restarting InDesign, the preferences still return false, the correct state.

Looks like the preferences are NOT setup on first launch, but use a boolean default value of "true".