For some reason, a while back, the drum grid stopped playing audio unless I saved and filled tracks with the programmed grid.

I've tried different soundfonts and different VSTs on a windows 7 PC with a X-FI platinum. I can't figure this out.

Any ideas on why the grid preview audio has disappeared? It is pretty difficult to program without it. I miss being able to press play in the grid and actually hear the parts I was programming before having to save it and paste it to a track.