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The problem was that RVIZ was compiled against Qt4 whereas when I try to load an image/ camera/ depthcloud in RVIZ, it finds Qt5 which was present because I installed opencv 2.4.10 whereas ROS comes with opencv 2.4.8. So, there was a qt conflict because of multiple versions of opencv. I uninstalled opencv 2.4.10 and then also uninstalled ROS with all its dependencies to do a clean install. After installing ROS again, it worked. Hope it helps!