STEPS TO REPRODUCE
1. Launch iClone 6
2. Apply a random prop (e.g. Ball_001)
3.Navigate to Menu > Plugins > iClone Indigo Render > Render Settings, change the value of Export Size to 1280x720
4. Click "Undo" on Toolbar
5. Click "Redo" on Toolbar

ACTUAL RESULT
Fail to restore the export size when clicking “Undo” / “Redo" on Toolbar

EXPECTED RESULT
Press undo and redo the value of Indigo export size can be restored immediately