While I was waltzing up and down the stack for the previous hang report. the SlickC debugger itself hung.
Using macro-break key combo, I stopped it - with this stack:
Break key pressed. Macro halted
debuggui.ex 13733 debug_gui_stack_update_buttons() p_window_id: 127 p_object: OI_TREE_VIEW p_name: ctl_stack_tree
debuggui.ex 46841 debug_gui_update_all_buttons() p_window_id: 73 p_object: OI_EDITOR p_name:
debuggui.ex 47040 debug_gui_switch_frame(1,3) p_window_id: 73 p_object: OI_EDITOR p_name:
debuggui.ex 13419 _tbdebug_stack_form.ctl_stack_tree.on_change(10,4,1) p_window_id: 73 p_object: OI_EDITOR p_name: