.gpx files in (some) public folder not found

In https://cloud.adfc-berlin.de/index.php/apps/gpxpod/publicFolder?token=ezKK7hTg6HwGWWx&autopopup=n&autozoom=n&showchart=y&tableutd=y&layer=OpenStreetMap&displaymarkers=y&showpics=y&transp=n&lineborders=y&simplehover=n&arrow=n&color=pace&picstyle=p&tooltipstyle=h&draw=tw&waystyle=Pin%2C%20Blue&unit=metric&track=all there are no .gpx files found any more (was working fine before upgrade to version 4.0.0 .

By the way - the german is 'Keine Strecke sichtbar' - the 'e' in 'Keine' is missing.

It is still working fine if Opening the directory not as public folder, but normally:

Clicking on 'Publish folder' one can see, that the .gpx tracks are there. The context menu for these files offer 'open in GpxMotion', but not 'open in GpxPod'. I am not 100% sure, whether I tested this public folder in the Pre-Release version for #157 (closed).