When I have a node in MEBN selected and make some changes to its parameters for a resident node, for instance, the node gets unselected (the box around the node disappears) making errors happen. This cannot happen. This problem is happening with other types of nodes also.
Now the node is kept selected even after making changes to it. The major concern was with resident nodes in MEBN, e.g., when removing parameters from the node selected. Young helped fix the bug.