if you have any version earlier than 5.0 than that could be the problem. I remember older versions would sometimes have this bug.
- yup i was right, checking the version5.0 bug fixes clearly states it.
http://www.softimage.com/support/xsi...0/default.aspx
Its somewhere their (ctrl+f) although i dont know if you can fix it on earlier versions, you might want to upgrade to 5.0