You didn't state what version of FM you are running. I don't know if this will fix the problem, I would verify these Font Setting. Go to Edit, Preferences, then click the font tab.
FM may subsitution a font for the real font because the font isn't installed on the machine or damaged. Reinstalling Filemaker would fix this, if it is the problem.
FileMaker Pro looks for a font that matches the specified font name and font script character set. If no matches exist, FileMaker Pro looks for a default font with the font script specified in the Fonts tab of the Preferences dialog box. If this fails, then the TextFont function uses the default font for the system script specified in the Fonts tab of the Preferences dialog box. This font might not be the same as the font script provided.
Reinstalling FileMaker is unlikely to solve the problem if the font file is damaged. In that case you would need to reinstall that font.
I assumed FileMaker ships with fonts that it installs. Yes that is my point that the fonts would have to be reinstalled.
I don't think FileMaker installs any fonts. It just usess the fonts already installed on the client machine. That's why using an unusual font can create this same issue when the database is moved to/accessed from a different computer that may not have that font installed.
I reinstalled the font. It is not the problem. FM is still doing it.
I am reinstalling FM and will see what happens.
I know that Edit-Preferences-Fonts controls the fonts but seems not to in this case.
We are talking Arial font here. Not some esoteric font. Arial is installed on every Mac and PC and Linux machine.
The machine which is displaying this behavior is a a newer machine and operates flawlessly otherwise.
Open the file with a full access password on the problem machine.
Try changing the font to something else as a test.
Let us know what happens.
Also, create a small brand new file with some layout text formatted to use the arial font and open it on the problem machine. Do you see italics in this test file?