The bug is on the VST3 version. The VST2 version works fine except the preset name from cubase that is not saved (always ‘default’ in the preset name).
For the X-EQ we have to use the presets system of the plug himself and the VST2 version…
I have the same problem. ( I demoing SSL X-EQ plug-in now ).
So thanx a lot for explain how avoid this problem.
It looks that vst 2 plug-in works fine and vst 3 plugin has that GUI ( and no sound ) bug in the same Cubase 6 ( 6.0.5 ) project.
That bug only apears after reopen ( saved ) Cubase project.