Andrew,
here is the test report:

- after setting the audio to not to use the plugins, I get the same error.
- I have then muted the drum track, and the song plays - even with the 'use dx plugins' setting.

Then I've tried to assign a real drum to the drums. There's a checkbox in the realdrum pane, 'show all the realdrums that are N/A'. I've checked it, and it shows.. the same realdrum list as if it was unchecked.

It seems I can't change the realdrumd on the drum channel on that particular song - may there is a style setting that prevent this ?

It seems to me, that the everything pack installation has messed up the realdrums.. what to do next ? Am I missing some realdrums update ? Or is that song demo that is in some way 'corrupted' ?

Thanks to nail the problem down,
Sergio.