Newbie unable to add/change preferred route

Fill in fields, click Plan Flight button, get Flight Plan Options matrix of routes and altitudes.

If at the bottom of the page I change the route in the “Preferred route” field, or enter one if it was empty, and again click the Plan Flight button, I get a page which says, “Error in your flight plan submission: * You must select an aircraft as well as performance profiles for climb, cruise, and descent. Please go back, correct the above errors, and try your flight plan again.” But there is an aircraft selected, etc. in the “FlightAware Flight Plan Form” which is below the matrix and below the FAA Flight Plan Information.

If you have a route you want to take, you can enter it on the first page and it will be planned for you.

Looking in to the aircraft selection issue. You shouldn’t have to reselect your aircraft on the form on the second page, but for now you can do that as a workaround.