Project treeview items will not de-collapse

[stop]

Binary package hint: anjuta

In the project pane there is a treeview that lets you select the files that are part of the project. In most of the cases the treeview is not de-collapse-able. So you cannot select any files.
Look at the following screenshot the determine what component of the application I am referring about.

ProblemType: Bug
Architecture: amd64
Date: Wed Oct 14 17:20:53 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: anjuta 2:2.28.0.0-0ubuntu3
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.46-generic
SourcePackage: anjuta
Uname: Linux 2.6.31-14-generic x86_64

[stop (whoopwhoop)]

When I single click the "triangle", nothing happens, when I double click it I get a new window with the properties of the selected item (i.e. "Target Properties" or "Group Properties".