Make sure you have the latest version of the R81.10 SmartConsole (or perhaps try from a completely different Windows system with SmartConsole installed):
sk175188: R81.10 SmartConsole Releases
Assuming you do and it looks like the button hit is actually registering (i.e. the button depresses) you may need to investigate the fwm process on your SMS via $FWDIR/log/fwm.elg. Regrettably the legacy fwm and not the newer multi-threaded cpm process still has to handle gateway/cluster creation and configuration operations, which is why those SmartConsole operations are so slow compared to creating/editing other objects.
Gateway Performance Optimization R81.20 Course
now available at maxpowerfirewalls.com