Does anybody know, or can anybody tell me where to ask about the following?

For a while now, I have been "fighting" with File Managers to automatically show my modified xdg user-dirs directories in their sidepanes or bookmark lists, and have not gotten far.

Suddenly, yesterday, when I booted, the two FMs PCManFM and Nemo both showed the xdg directories, and both were using the ~/.config/gtk-3.0/bookmarks file, which had not been true the day before when I had been experimenting with adding/removing that file or the other bookmarks file (~/.gtk-bookmarks), and adding/removing bookmarks.
The bookmarks file was dated as of yesterday's boot.

Today, it is dated as of today's boot.

Neither FM was updated recently, but I installed an updated Linux kernal (3.13.0-30) on Sat. or Sun.

This brings to mind the question:
Did the latest kernal change anything that relates to xdg user-dirs, or to the file: ~/.config/gtk-3.0/bookmarks?
What might have changed to Linux, that might have changed the behaviour of the two FMs?

Again, if this is the wrong place to ask (or people here don't know), where should I ask?

Thank you.