X3 Région FX not working anymore after Melodyne Studio 4 upgrade

Hello Cakewalkers !
Almost everything in the title...
Everything was fine before the upgrade (from Melodyne Editor)
Melodyne Studio 4 works perfectly in standalone mode, but it is now impossible to create a Region FX.
The process starts... and stops just when the Melodyne view is about to open (flashing window) !
It is possible to use Melodyne in the FX bin...
And Region FX still can be created with VVocal...

Any clue ?

Thank you very much for your help...

Jeff