--- Operating System, Graphics card ---
Gentoo amd64
nvidia 9800gt 1gig

--- Blender version with error, and version that worked ---
blender 2.65a/trunk r53646
segmentation fault
--- Short description of error ---
When in the compositor I click the x "unlink data block" in the image node it crashes to the desktop/terminal
The image is a multilayered exr file created with blender.

--- Steps for others to reproduce the error (preferably based on attached .blend file) ---

Use this blender file http://www.pasteall.org/blend/18707
Unlink the data block in the image node in the composite window.
Enjoy crash.