wkhtmltopdf从文件随机空框生成PDF

Question

I'm using wkhtmltopdf to create a pdf from a file (using PHP if that's important) and it's working great except for a random empty box. Here is what I've tried to get the box to go away:

1. Changed encoding for wkhtmltopdf to be UTF-8
2. Made sure the file was encoded using UTF-8
3. Checked the MySql database that it's pulling from to make sure that the encoding was UTF-8
4. Doubled/Tripled checked to make sure there is no extra character at the end of the line.
5. Deleted and re-inserted the database row
6. Rendered everything except that database row and the box wasn't there, so I know it's that entry.

Here is a copy and paste of the box from Adobe Reader in case it helps:

Answer 1

Finally figured it out. It appears that the issue wasn't with the text or database row at all. It was trying to use Helvetica. I'm not sure why this caused an issue on just that one row, but it did. I switched to Arial and it works perfectly.