Any system with blender installed by root
Broken: 2.76b 2015-11-03 10:56 f336fea
Short description of error
When trying to save presets for the sapling add-on, attempts are made to write to directories outside the current user's home directory. As a result, the preset is not saved, because of file permissions.
Exact steps for others to reproduce the error
In object mode: Add/Curve/Add Tree, then try to "Export Preset"