--- Operating System, Graphics card ---
Linux SuSE 12.2 (x86_64)
NVidia GTX560ti (official driver)

--- Blender version with error, and version that worked ---
2.65a r53177 and earlier are ok
2.66 r54697 and later have issue

--- Short description of error ---
User prefs 'Reset to Default Theme' makes all Matte and Distort nodes titlebars go black. Looks to be related to the introduction of custom titlebar colours for these nodes.

--- Steps for others to reproduce the error (preferably based on attached .blend file) ---
- switch to compositor, add any matte or distort node
- user prefs->themes->node editor subsection
- reset to default theme