my fault was, that i had wrong registry entries for the "content" folder ([HKEY_CURRENT_USER\Software\4Front\TruePianos]) - i changed the drive letter (matthews wizard was right).
the entries have to point to drive "p" (because your usb-stick (plugged into the v-machine) is "p" and the path had to be the path like on your usb-stick without the "plugs" folder (as i remember right). when i was at your point (plugin load in v-machine but no sound) all i had to do was change the wizard-file (or more easy) change the "vfxinfo.txt" at your usb-stick. you dont need to reimport the plug to your vfx-software.
BUT: in the vfx software you hear the piano sound when you play the virtual keyboard ???
hope that helps - but i am only a user - no warranty )