Drum and bass VSTs not stopping together

When using GP v3, I used to be able to stop my drum vst and bass vst at the same time with a foot pedal press. Now the bass carries on playing while the drum stops. I seem to have forgotten the setting for the sync. What have I missed?

Did you simply load your GP3 gig file in GP4, or did you try to rebuild a GP4 Rackspace from scratch? It could be interesting you to post a small GP3 gig file with a Rackspace that do the job. We could have a chance to understand what worked for you before without knowing anything about your plugins and the way you controlled the STOP action.