Hi @arunava_nag,
we experienced the same ros2/rviz error that you describe.
In our case the problem was not with Qt, but with loading the default config using yaml-cpp.
This results in the empty window.
Can you check if you have a yaml-cpp 0.5 package installed with apt?
If yes, uninstall it and try again, ROS2 comes with its own yaml-cpp.
Are you using the binary build of ros2/rviz or are you building it from source?
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