If you quit fman while the left pane is showing drives (Alt+F1), you will get the following error next time you open fman:
DirectoryPaneListener 'StatusBarExtended' raised error.
Traceback (most recent call last):
File "...\statusbarextended\__init__.py", line 88, in on_path_changed
StatusBarExtended.refresh(self)
File "...\statusbarextended\__init__.py", line 21, in refresh
pane2 = panes[1].id
IndexError: list index out of range
It doesn't happen when showing drives on the right pane.