Batch edit with MKVToolnix not working?

[Greatestguru]

I've been using this batch file to edit MKV files since last November, it doesn't seem to work anymore. Any help?

dir/b/s *.mkv >list.txt
for /F "delims=;" %%F in (list.txt) do "C:\Program Files\mkvtoolnix\mkvpropedit" "%%F" --edit info --set "title=%%~nF"
del list.txt

for %%a in (*.mkv) do "C:\Program Files\MKVToolNix\mkvmerge.exe" -o "tada\%%~a" --audio-tracks 1,3 --subtitle-tracks 6 --default-track 3 --default-track 6 "%%~a"

[sneaker]

1. Any error messages? Log?
2. Which part is failing: mkvpropedit or mkvmerge?
3. Are all the tracks in the files in the expected order (--audio-tracks 1,3 --subtitle-tracks 6 --default-track 3) - check using: mkvmerge.exe -i "filename.mkv" (other programs may show a different order so are not necessarily helpful)
4. Reading/writing rights in the folder?