iClone 8 Version: 8.5 (8.5.3330.1)
Following the removing full expression Reallusion guide, provokes a crash and project restoration.
In order to reproduce it I create a Motion Live expression clip (using iPhone Live Face), then I try to reset the expression with Face Puppet.
SUGGESTION: It would be nice to have a key shortcut instead of must following a guide, to simply reset character expression. Or even better, you could make optional to automatically reset face expressions at the end of a face clip (puppet or motion live).
Guide:
https://manual.reallusion.com/iClone_7/ENU/Content/iClone_7/7.9/08-Animation/Facial-Animation/Removing-Facial-Expressions.htm