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Highlighting @gvdhoorn's previous suggestion (for others that come across this issue) that the issue may be related to locales.

Some rviz users have encountered a similar issue on newer ubuntu/debian versions e.g. ROS Lunar on Ubuntu Artful or ROS Melodic on Ubuntu Bionic (see for example: https://github.com/ros-visualization/rviz/issues/1249).

If that's the underlying issue, modifying the following environment variable will fix it:

export LC_NUMERIC="en_US.UTF-8".

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