I just noticed the latest OSX upgrade for the PMI BOSENDORFER 290 VST is on-line:
PMI BOSENDORFER 290 MAC OS X INSTALLER software update V.1.0.3
MAC OS-X DFD extension V.1.2.9

The new DFD extention fixes numerous issues for OSX users.

You can download these new updates and get the latest installation instructions on the :
SoundsOnLine Support page