when using the extension aww-switcher imagemagick post op no output is created until the directory ~/.cache/vicinae/awww-switcher is manually created.
to repropduce:
set ImageMagick Post-production to blur.
switch wallpaper
No: ~/.cache/vicinae/awww-switcher/postprod.jpg
when creating ~/.cache/vicinae/awww-switcher by hand the file ~/.cache/vicinae/awww-switcher/postprod.jpg does appear.
Looking in the source of the extension only the fucntion : runConvertSplit does create the directory. Not the function: runPostProduction