Thank you for your post.
Testing and Development is currently aware of this issue. I am forwarding this post for review. When I receive any feedback, I will let you know.
Note using a different mouse may result in the issue being less frequent.
Thanks TSPigeon. I will try another mouse if I can find my old one around here.
This issue appears to have been addressed in FileMaker Pro 14.0.4.
Thanks for the info. I will download and test it shortly.