A small logo of Dolby Digital or DVD-Audio missing when play DVD-A or DVD software with SPDIF

I can see these logo before when I play DVD-A or play DVD movies with SPDIF enabled on DVD software such as PowerDVD. And now it's gone, when play SPDIF, it does not show these logos at all.
I appreciate any advises.
Thanks

for the logos, someone asked how to know what kind of signal his card was decoding. I provided 2 examples:
http://shingoyab.free.fr/creative/dolby.jpg
http://shingoyab.free.fr/creative/dts.jpg
if you don't see them but hear correct surround sound, don't bother. On some situation (not determined which one though) the logo disapears. I lost them some rare times. Last times was when listening to some DD music when programming small homeworks in OpenGL.

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