STEPS TO REPRODUCE
1. Launch iClone 6
2. Apply G5 character Chuck
3. Go to Modify > Edit, launch "Avatar Proportion" panel
4. Navigate to Body > Scale > Depth, drag the slider to 150
5. Click "Reset" /"Reset All"
6. Click "Undo" on Toolbar

ACTUAL RESULT
Nothing changed until click "Undo" again

EXPECTED RESULT
If click "Reset" /"Reset All" on both Avatar Proportion and Finger Tab panel, only click Undo once to back the previous result