Dear Sirs,


I want to prepare a forma for handwriting filling. With this propose e
use \blackrule  command for trace some lines inside paragraphs. For
example, 


I, \blackrule[width=5cm, height=0.05cm] , promise maintain a good... 


In the pdf document appears: I,
<bold><fontfamily><param>Helvetica Neue</param>!max</fontfamily></bold>___________________
, promise maintain a good... 


Are there a good reason for that?


Thanks


Jorge