This is not actually an issue with anything related to PreSonus. This is an issue within the Sonivox Big Bang plug-in. They have not made a fix for this yet, but the only way to make it work without crashing is to click the "MIDI Learn" option as soon as you boot up the plug-in.
I had to go on the web for quite awhile to figure this one out after I bought the same plug-in. It works, but it does make it a bit more difficult to edit the parameters due to it trying to learn your MIDI device.