SkinStudio
(on Left side) click Edit StartMenu and Taskbar
(from center section) click Edit Start Menu
(new window pops up)
(on left side) Left hand side / click Bottom bar
(tab on bottom of window) click Extra Settings
(middle of window) click Background effect Blur
(to the right of that) options change to "no semi transparency" / "Semi transparency" / "Blur" click "Semi transparency"
(middle of window) what showed as "Background effect Blur" should now show "Background effect Semi transparency"
That'll fix the bottom blur, might want to change other sections in the Start Menu to match, text can get tricky to read on very clear glass though.
Hope that makes sense? I've really got to sign up with an image service one of these days.