There's multiple ways to get FileMaker to print or generate a PDF. What method are you using?
Did you select Print from the file menu? Save|Send Records as | PDF?
Or are you clicking a button that performs a script?
What does happen when you try this? Nothing at all? The file closes/crashes? Or ?
Since a single file is showing this behavior, unless a script is involved that is changed or encounters a design change that keeps it from working, you may have a damaged file. You can try recovering the file. Even if the recover process doesn't report a problem, test the recovered copy to see if it works for you.
Things to keep in mind about Recover:
- Recover does not detect all problems
- Recover doesn't always fix all problems correctly
- Best Practice is to never put a recovered copy back into regular use or development. Instead, replace the damaged file with an undamaged back up copy if this is at all possible. You may have to save a clone of the back up copy and import all data from your recovered copy to get a working copy with the most up to date information possible.