Hello! Sorry that this is not working for you! We tried to reproduce this problem in-house but fraps recordings worked for us when we tried.
Please contact our support staff at https://support.techsmith.com/ <- this is a free service we provide to our customers. Our support staff will be able to work with you to figure out what's going on and hopefully either provide a resolution for you or - if that's not possible for some unforeseen reason - help the dev staff determine how to get it working for you in an upcoming update.
Thanks! Clint Hoagland QA Practice Lead TechSmith Corporation