I just tried running TPFMM again and this time I think you might find the last part of interest.
(TPFMM:18358): Gtk-CRITICAL **: 21:51:26.168: _gtk_widget_get_preferred_size_and_baseline: assertion 'GTK_IS_WIDGET (widget)' failed
(TPFMM:18358): GLib-GObject-WARNING **: 21:51:26.187: invalid unclassed pointer in cast to 'GtkTreeModel'
(TPFMM:18358): Gtk-CRITICAL **: 21:51:26.187: gtk_tree_model_iter_n_children: assertion 'GTK_IS_TREE_MODEL (tree_model)' failed
(TPFMM:18358): GLib-GObject-WARNING **: 21:51:26.187: invalid unclassed pointer in cast to 'GtkTreeModel'
(TPFMM:18358): Gtk-CRITICAL **: 21:51:26.187: gtk_tree_model_iter_n_children: assertion 'GTK_IS_TREE_MODEL (tree_model)' failed
(TPFMM:18358): Gtk-CRITICAL **: 21:51:26.203: gtk_window_set_default_size: assertion 'width >= -1' failed
(TPFMM:18358): Gtk-CRITICAL **: 21:51:26.203: gtk_widget_set_size_request: assertion 'width >= -1' failed
commonapi.init 20190331
(TPFMM:18358): Gdk-ERROR **: 21:51:26.553: The program 'TPFMM' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadImplementation (server does not implement operation)'.
(Details: serial 2780 error_code 17 request_code 20 (core protocol) minor_code 0)
(Note to programmers: normally, X errors are reported asynchronously;
that is, you will receive the error a while after causing it.
To debug your program, run it with the GDK_SYNCHRONIZE environment
variable to change this behavior. You can then get a meaningful
backtrace from your debugger if you break on the gdk_x_error() function.)