Product and version: FileMaker Pro Advanced 15.0.1
OS and version: OS X 10.10.5
Hardware: MacBook Pro late 2011
In Layout mode, opening the Button Setup window and closing it without making any changes causes the selected object to become grouped with an empty button.
How to replicate:
After every inspection or use of the Button Setup definition remember to un-group the effected object.
Thank you for your post.
Our Development and Testing departments are aware of this change in FileMaker Pro 14. The modal dialog was replaced with a heads-up display in FileMaker Pro 14, so a cancel option is not available. I have attached your post to the request to revert back to a modal dialog. When more information becomes available, I will post again.