The target path of the FODDER excutable should be this
"C:\Program Files\Sony\Station\LaunchPad\LaunchPad.exe" /game:planetside /batch:2007908 /plan:426
If you right click on the planetside icon ( the one you start the game with) once and go to properties, you'll see the "target path or start in" in the bottow of the window. If your buddies "start in" icon doesn't have this above path, copy this in entirely and see what happens.
I'm not saying this is the fix, this is just my 2 cents