Check to see if the "End of Chorus" Box shows the correct final bar number of the song. If this doesn't work, you can highlight the part of the track in which you want the RealDrum to fill or add the shortfall number of Bars to increase the End of Chorus Bar number. If all else fails then you are down to cutting and pasting to fill the missing section. Note that Part Markers can be added for A and B Parts in RealBand and are needed to obtain Drum Fills.