The same demos that played before do not play now. Try this and see what you get:
1. Open any song
2. Right click on any track except Drums
3. In the dropdown box click on Select Hi-Q MIDI Synth patch; you'll get a dialog box labeled Select a Prefix F/X for track and a list of instruments
4. Select any instrument then click the Play button (green arrowhead). If you get a Message box click OK
What happens for you now?
When I do this I get an error message that says "there is no audio demo available for this file". The same thing happens when I click on Select MIDI Synth or Audio Plugin in step 3.