When using the folders panel treeview, if a directory [red] contains symlinks to other directories [green, blue], it [red] will not be able to expand, and thus they symlinked directories themselves [green, blue] won't be expandable, because you can't see them. However if you add a single non-symlinked directory [orange] to the original directory [red], then all the expansion works. 

Here's screenshots showing the bug:
Two folders, one contains directories One (with subdirectory), Two, Three; the other contains symlinks to these three directories. On the right side, both are expandable
http://teeks99.com/keep/SymlinkTreeBug/UnExpanded.png

Here's the tree's expansion of the normal directory
http://teeks99.com/keep/SymlinkTreeBug/RealContents.png

Here's the attempt to expand the directory containing the symlinks:
http://teeks99.com/keep/SymlinkTreeBug/Symlinks.png

Here's the workaround (adding a real dir to the symlinks dir):
http://teeks99.com/keep/SymlinkTreeBug/Workaround.png

Reproducible: Always

Steps to Reproduce:
1. Make a folder with sub folders, see tree expansion
2. Make another folder with symlinks to each of the sub-folders in the original, no tree expansion
3. Add a normal (non-symlinked) folder to the second folder, refresh, see the tree expansion.
Actual Results:  
Workaround solved the problem.

Expected Results:  
Workaround solved the problem.