flashplugin-nonfree-9.0.48.0.0ubuntu9 did not attempt to fix this bug so it is not strange that it is still present.
However you seem to have some other problem with your nspluginwrapper. -n is a ubuntu specific option that is patched into nspluginwrapper and it is working fine for me. If it is not working for you then that is a separate bug that you should report against the nspluginwrapper package.
flashplugin- nonfree- 9.0.48. 0.0ubuntu9 did not attempt to fix this bug so it is not strange that it is still present.
However you seem to have some other problem with your nspluginwrapper. -n is a ubuntu specific option that is patched into nspluginwrapper and it is working fine for me. If it is not working for you then that is a separate bug that you should report against the nspluginwrapper package.