MasterPlan is running fine on my Windows machine!
Along with the text highlighting and text wrapping in task descriptions - which I think is pretty important considering people will be copy and pasting things from previous planners to this one - an export option would be pretty cool as well. Maybe you can "export" the current screen at a set dpi (higher resolution depending on how far the user zooms out, they can choose how detailed they get or something like that) to pdf.
A note on text wrapping, it'd still be good to be able to have a customization text-description-box size that you can drag to make bigger or small but that wraps the content in the set size. That might feel better than to adjusting the size automatically depending on the context.