Thank you for your post.
I am able to replicate the issue under both Mac OS X 10.9.2 and Windows 7. Interestingly, if I place my cursor over the radio button field (no clicking), the value changes. Again, both Mac and Windows.
I have sent your post and file to our Development and Testing departments for review. When I receive any feedback, I will let you know.
An entry in the Known Bugs List has been linked to this Issue Report. Any Comments/Questions/Suggested Corrections should be posted here or in a new thread. Please do not post such comments to the Known Bugs List thread.