No more opengl_spectrum_win32 vizualisation with new xbmc-8.10

Hi,
i've been using and working on my xbmc (Alpha 2) configuration since 2 weeks...
Quickly, i've adopted the very nice MediaStream skin to use in xbmc...
In 2 weeks, i found MY setup... and all was fine... my favorite feature is the opengl vizualisation with the OSD Menu downscreen, with the song info (album art, time, track...)

I've just updated to the new stable version 8.10 but it seems that the opengl, at least for me, doesn't work anymore with the MediaStream Skin.
I've tried with others skins, and it works well...

Is there any way to "make appear" the vizualisation during music play with the keyboard ?
I've tried the "V" key as wrote on the Online Manual... but i've nothing...

Thank you for all
Benjee from France.

it's the 'tab' key

Thank you...
That's it...