[oldpoem]

I can't get this to work with XYSubFilter, I added it to filtersconfig and mediasconfig, and files start up and play with SVP interpolation working correctly, but no subtitles are visible. Not even ones that worked previously with the Kodi internal filter.

Any idea why that might be?

First troubleshooter , press "o" when playing file to see if xysubfilter loaded in active filters list. Then open xysubfilter properties panel and check if it set to always load.

If both checked and still no subtitle displayed. Post your mediaconfig / filtersconfig.