Sorry to hear you are having problems with CrazyTalk Animator 3.
Is this problem occurring in all projects or just this particular project?
If you have a saved copy of the project, try closing CTA3 down, restart, and then try again to delete the voice clip. Is it successful now?
If you continue to have problems with this it would be wise to contact our Technical Support team using the link below. They will be able to advise you further.
http://www.reallusion.com/CustomerSupport/UserEx/QForm.aspx
Peter
Forum Administrator
www.reallusion.com