c3847269c296c5e09002d5dc7fb0335ac84b4667
When the i/o channel spinbox widgets are realized, they call print_channel_count(). A "0" is formatted as "all available channels". This causes the GTK::Entry inside the spinbox to emit a "changed" signal which in turn triggers a parameter_changed(), [..], store_state(), which calls into the spinbox again while it is being realized, which makes gtkmm barf. Start Ardour with JACK running (autoconnect to jack), Window -> Audio/Midi settings -> initial no_control_notebook. Change Audio System -> [control widgets are realized] -> glibmm std::exception
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