I can't reproduce what you describe by simply install Audacious.
However, when Audacious is installed it add a new context menu to Caja to open a folder with Audacious. It is possible you have associated this context as the default open folder action.
I can't reproduce what you describe by simply install Audacious.
However, when Audacious is installed it add a new context menu to Caja to open a folder with Audacious. It is possible you have associated this context as the default open folder action.