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[Topblast_]

I am currently trying to render Gwen gui, but at some points it renders with a white background where it should be alpha, and others it just renders a white box.

m_pDevice->SetRenderState( D3DRS_ZENABLE, FALSE );
   m_pDevice->SetRenderState( D3DRS_ALPHABLENDENABLE, TRUE );
   m_pDevice->SetRenderState( D3DRS_SRCBLEND, D3DBLEND_SRCALPHA );
   m_pDevice->SetRenderState( D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA );
  
   m_pDevice->SetSamplerState( 0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR );
   m_pDevice->SetSamplerState( 0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR );
   m_pDevice->SetSamplerState( 0, D3DSAMP_MIPFILTER, D3DTEXF_NONE );
  
   m_pDevice->SetSamplerState( 0, D3DSAMP_ADDRESSU, D3DTADDRESS_CLAMP );
   m_pDevice->SetSamplerState( 0, D3DSAMP_ADDRESSV, D3DTADDRESS_CLAMP );
  
   m_pDevice->SetTextureStageState( 0, D3DTSS_COLOROP, D3DTOP_SELECTARG1 );
   m_pDevice->SetTextureStageState( 0, D3DTSS_COLORARG1, D3DTA_TEXTURE );
   m_pDevice->SetTextureStageState( 0, D3DTSS_ALPHAOP, D3DTOP_SELECTARG1 );
   m_pDevice->SetTextureStageState( 0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE ); 
  
   m_pDevice->SetTextureStageState( 1, D3DTSS_ALPHAOP, D3DTOP_DISABLE );
   m_pDevice->SetTextureStageState( 1, D3DTSS_COLOROP, D3DTOP_DISABLE );

[Solid_Spy]

I had this same problem just recently. How are you rendering the GUI? Are you using stretchrect?