Enable missing disclosure triangles in Finder

The problem is with the arrangement chosen for the list view. Using any of the following methods, choose Arrange By | None:

The View menu from menubar
The gear icon in the Finder window
The contextual menu (right + click mouse button)

The Finder in Mac OS X is the application is always running and provides access to the file system of the computer. This is the Windows Explorer on Windows systems, or something like Nautilus on Gnome-based Linux systems. The primary interface is a folder paradigm that presents files and folders in a number of different views.

On the Mac, these views are icons, list, columns, and Cover Flow. To the Finder, the list view is a "stacked" presentation of the files with alternating background colors and a nice feature Apple calls a "disclosure triangle." This control is present on directory items, and when clicked, will either expand the listing to show a nested view of the contents of that folder or contract an already expanded listing.

Finder in Mac OS X with disclosure triangles in list view.

The problem is that sometimes these disclosure triangles aren't present.

Disclosure triangles not present.

Setting the Arrange By option to "None" will restore the disclosure triangles.

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