Start up P3dv4 with default flight cause crash

Hi,

I got problem with P3dV4.  Whenever I start it up it will enter to default flight which is F22 Raptor parking on the sea on the west of Africa.  I try to set another flight with my 747-400 and save as default flight.  Before saving the flight, I check on Green "Default" check box.  The airplane change to 747-400 but it stays on the same place, on the sea, then the plane crash into the water.  I don't know how to fix it and google about it.  I found no answer about that.  Would you please help me?  It is annoying.  Moreover, I cannot save any of my flight at all.  It will be the same, start on the water near Africa.