> Then if I type "quit" to get the prompt back, the window > persists as required, but grid button no longer works.
You are trying to use "persist" for something beyond what it was intended for. Yeah - if you type "quit" the program quits and then you can't make any new plots. Since zooming or grid generation or various other things require recalculating the plot, it won't work once you quit. Now it is true that some terminal types are smart enough to toggle the grid on/off even in persistent mode after the main program has exiting. It would be possible to make qt do that also, but only if the original plot already contained a grid. And that is only possible because it isn't really necessary to regenerate the whole plot just to make the grid lines [in]visible. It doesn't change the basic limitation. If toggling the grid is important to you by itself, could you please file a feature request for uniform support to toggle it off in terminals that support a persistent mode? It would be easy in qt, but I'd have to think about the other terminals. Ethan (sfeam) - upstream devel team -- debian-science-maintainers mailing list debian-science-maintainers@lists.alioth.debian.org http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/debian-science-maintainers