Today we're sending out Version 1.9 of the Group Formation System which fixes a couple of bugs, main one being version 1.8 broke a functionality:
NOTE: Adding or removing movers on the fly should not be used while playing a recording or with the Performance Director.
Caspervend will automatically send to customers who purchased the Group Formation System or you can come by the Spot On Store and click the Redelivery Terminal at the landing point.
1.8 fixes an issue that sometimes happens on laggy sims where movers would rez but not move into their positions and wouldn't invite dancers properly. That no longer should be a problem with this update. Your update will be automatically sent through Caspervend or you can come to the store and click the Redelivery terminal.