Running on Linux, GMAT consistently crashes with a segmentation fault on exit if the user leaves an OrbitView window open. To see this, run GMAT on Linux from a terminal window. Run the Hohmann transfer sample script. Close GMAT using the close button on the window frame. GMAT will close, but in the close process, it looks like it is trying to delete an already deleted handle. Here is the backtrace:
The crash is seen on Linux. It might have implications for other platforms, or it could be a "feature" of wxGTK.