F I X E D!
Waves V9r11 is out, no double plug-ins anymore! 
April 25th, 2013
Waves V9r11 installers include the following changes and bug fixes:
1.The new GEQ Graphic Equalizer available separately, and in Mercury, SoundGrid Pro and SoundGrid SD7 Pro.
2.Cubase: fixed possible crash during plugin scan.
3.WaveLab 7 on Windows: fixed issue of plugins appearing twice on the menu.
All is OK now 
