Dolphin-emu's unofficial SVN build : 3661

[Xtreme2damax]

The old DX9 plugin is no longer working in the newer revisions Luis, the new plugin specifications changed making that plugin completely obsolete.

Only way to use the DX9 plugin now is to use an older revision, and sacrifice all the fixes contained in the newer revisions except for the sound fixes (Replace DSP_HLE plugin with one from the newer revisions)..

You could also wait for a new DirectX plugin or the existing DX9 plugin to be updated, not sure how long it would take but it doesn't seem like a high priority concern of the developers at the time.