This is a known issue.
For More Information see: FM 12 preview mode issue
This is one of many acknowledged bugs that can be found in the Known Bug List thread here in the Report an Issue section of the forum.
It can also be downloaded as a database file from: https://www.dropbox.com/s/jt09b82i0xijbu3/FMP%20Bugs.zip
No, even Verdana has some differences when the font is small enough. Maybe they all have a slight difference, but it's a LOT more visible when the font is small.
The "Known Issue" you refer to is not clearly the same issue. They talk about text flow differing when upgrading to FM12, and differing when printing to PDF.
I am talking about text flow differing between Browse and Preview. And getting cut right off in mid word at small sizes.Seems like either a different problem, or a LOT more info than they had before.
The issue exists in both FileMaker 12 and 13.
As far as I can see here, it is the same issue as what you have reported here. In the issue report thread, the results that they got when they printed or saved as PDF matched what they saw in browse mode but did not match what they saw in Preview mode due to differences in how the text wrapped to the next line in the field.
Is that not what you are seeing here?