When I open rviz after starting gazebo, rviz auto-selects /odom for the fixed-frame. However, in the pull-down menu, /odom does not appear, and the robot is not visible when /odom is selected. Instead, I have to select some other reference frame on the turtlebot, if they are available. Sometimes, even when /odom is selected automatically, nothing appears in the drop-down fixed-frame menu, and I cannot do anything to make the robot appear. Is there any way to change either of these things from happening? There does not seem to be any reason why one happens instead of the other, and sometimes the pull-down menu is populated after quitting rviz when it was not, and sometimes it works the other way around.
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