Hi, I have some filters on the frontview,
I see the code :
..
<!-- BRICK : filters -->
<div class="pull-left">
<?php echo $this->filters->input;?>
</div>
<div class="pull-left">
<?php echo $this->filters->input;?>
</div>
<div class="pull-left">
<?php echo $this->filters->input;?>
<?php echo $this->filters->input;?>
</div>
..
etc..
but i see absolutely nothing !!

You really should provide more information here

If you want to debug that, verify that $filters contains an not empty array.
You can dump the var in the template.

If it is empty, then verify the XML file containing the filters.

If still you experience problems, then I will check your project.
What is the PTL ? (Project / Table / Layout)