This problem is only on MAC OS 32bit. MAC OS 64bit is OK. Windows is also OK.
On Cubase, There are two way to use a VST.
case 1.Use Insert Button On Left Side. Push Insert Button and select a VST.
case 2.Use Audio Tab on Top. [Audio] -> [Plugin] -> Select a VST.
When I select a VST on Cubase 6 by case 2, GUI is not controlled. case 1 is OK.
On MAC OS 32bit, must I do special something?