CRASH when Changing Instrument Order in Conductor Score

After loading all instruments into my conductor's score, I attempt to use the Up/Down arrows to place the instruments in the order I prefer. I checkmark the box of the instrument I need to move (up or down), then click the up or down arrow. Immediately it crashes causing me to have to rebuild it from scratch. Early on, when the ability to move the parts was available, there were no issues. It seems that in the last update, something must have happened that's causing it to crash. Your assistance is greatly appreciated.
Dale Harris