I would assume that you have tried this with a newly created file? (Always a good thing to report that detail as it rules out potential issues with your file...)
Thank you for the post.
I replicated this on my work station running FileMaker Pro 12v3 installed on Mac OS X 10.7.5 and Windows 7 using the steps provided. I have forwarded your report and the sample file to Testing and Development for review.TSFalconFileMaker, Inc.