Receiving "Segmentation fault (core dumped)" when attempting to execute rosrun rqt_graph rqt_graph?

[paytondepalma]

Running ROS Melodic on Linux and I've been trying to make use of rqt_graph. I followed the install instructions on http://wiki.ros.org/ROS/Tutorials/UnderstandingTopics#Using_rqt_graph, but when I go to run rqt_ graph, I receive the following message:
Segmentation fault (core dumped)
I've tried purging and re-installing the packages, but still no dice. Any idea how to get rqt_graph up and running?

Thank you!