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[C++, DX9] Trouble rotating billboard sprite

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Hi there, I used ID3DXSPRITE to create my billboard sprites but I'm having some trouble spinning them around the Z-axis. The rotation works fine if I'm not using the billboard flags though (D3DXSPRITE_OBJECTSPACE | D3DXSPRITE_BILLBOARD). Can anyone tell me what I'm doing wrong? Thanks! Here're some code snippet if it helps:
m_graphics->GetSpriteCOM()->SetWorldViewLH(m_worldPos.GetMatrix(m_graphics), m_camera.GetMatrix());
m_graphics->GetSpriteCOM()->Begin(D3DXSPRITE_OBJECTSPACE | D3DXSPRITE_BILLBOARD | D3DXSPRITE_SORT_DEPTH_BACKTOFRONT);

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D3DXMATRIX matScale;
D3DXMatrixScaling(&matScale, m_scale.x, -m_scale.y, 1.0f);
D3DXMATRIX matRotate;
D3DXMatrixRotationZ(&matRotate, D3DXToRadian(m_rotation));
m_group->GetID3DXSprite()->SetTransform(&(matScale * matRotate));
spritePos = D3DXVECTOR3(m_pos.x, -m_pos.y, m_pos.z);

if (FAILED(m_group->GetID3DXSprite()->Draw((m_group->GetTexture()->GetTexture()),	// The texture we want to draw from
				&srcRect,   // Clipping area to get image from
				&D3DXVECTOR3(m_center.x, m_center.y, 0.0f),   // Center of sprite rotation
				&spritePos,   // X, Y, Z position of image
				m_argb)))   // Color tint
		return FALSE;

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No one tried rotating ID3DXSPRITE billboards before? [sad]

After some further testing, the billboard sprite seems to be moving in circles instead of rotating... and it does a quick 180 degrees flip while moving through the lower half of the movement circle (hope that makes sense).

Could it be due to problem with the matrices that I passed into SetWorldViewLH?

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