I had tried until three times, may be more to fix this trouble of Cairo Dock v3.2 position on my Raring Desktop. I don't know why, Cairo Dock always show wrong position, as you can see on my pict attached here. I must be at the center on the edge of bottom. I can fix it, by configuring via System -> Composition. Then, give thick on the Composition, click Apply, and remove thick on the Composition, then Apply. But can you explain why Cairo Dock show wrong position on my Raring desktop? Note, I run Cairo Dock with OpenGL.