I have used xdg-user-dirs to redefine the standard directories away from /home/scott to directories in another partition: /data/scott.
The side-pane does not show these directories, with the exception of Desktop.
The standard directories shown, when clicked-upon, result in an error window that contains the non-existant directory name "AA_Directory_Hide"
Ex: When "Music" is clicked-upon, The error window text states: "The specified directory '/home/scott/AA_Directory_Hide/Music' is not valid".
This is NOT the first program to exhibit this phenomenon, so it is possible that PCManFM is merely passing on the (inaccurate and/or missing) information that it is given.
Ex: There appears to be a standard dialog that pops up when "Open" or "Save[ As] is selected from various programs [What IS this program, by the way, please?]. They show all my xdg-user-dirs re-directed directories under Places, but have all the standard directories listed under "Bookmarks", and the tool-tips that appear when hovering over one of them also contain the spurious directory "AA_Directory_Hide"
[There is another "standard" open[/save?] dialog that a few other programs seem to use, that has my xdg-user-dirs Desktop, but that is all - no "standard" directories, either.]
If anyone has a clue what is going on here, whether it is a PCManFM bug, or something else, I would love to hear it.
PCManFM 1.2.0 (from Help/About - there seems to be no --version terminal option...)
scott@scott-AsusM2N68-AM-Plus:~$ uname -a
Linux scott-AsusM2N68-AM-Plus 3.13.0-24-generic-tuxonice #47~ppa1-Ubuntu SMP Tue May 6 14:40:05 UTC 2014 i686 athlon i686 GNU/Linux
scott@scott-AsusM2N68-AM-Plus:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04 LTS
[This is actually Lubuntu]