Thank you for your post.
I am unable to replicate both issues (button bar segment wrap and font size change).
Since the layout theme is Classic, what prior version of FileMaker Pro created the file?
What is the formula used for the "Hide Object when" calculation(s)?
Is the text in the button bar static or calculated?
I would like to see a clone of your file. In the clone, remove all other layouts and any unnecessary fields/objects from the layout. I have sent you a private message with instructions where to send the file.
The file was created in v11 ( or earlier ), we first saw it in .fp7 format.
Hide Object when calcs are simply: Get ( WindowMode ), apply in Find Mode checked.
The text is static.
It may be a little while before I can supply a clone. I have immediate access to a copy of the file made before the buttons where converted to a button bar. In this copy, I added a button bar to the layout which is similar but the problem does not occur.
If you added a similar Button Bar that does not have the issue, what is the difference between the two Button Bars?
On the layout, create a new Button Bar (do not duplicate), and apply each button sector one at a time until you notice what breaks. This could help determine the cause.