DO11: label filters for new files don't work anymore

This is strange: while my label filters for file groups like the image file group work well, they fail to apply the color to new files.
In this case, i see various .png files colored green, but if i paste a new .png file into the same directory, it remains black (no label filter).

The same happens with other file types, like .rtf files, which are in the documents file type group.

Sorry, my mistake. I had some wrong setting in my system of exclusions, to make files newer than three days having a special label applied.