Download File Bug: weird characters !

[eluser]yannyannyann[/eluser]
Hi everyone,

I have a bug on my site, when user clicks my DOWNLOAD FILE button, the image, video or sound file doesn't get downloaded but the browser displays characters, here an extract :

Code:

�����JFIF���������;CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90 ���C�     ���C    ���,�"�������������� �������}�!1AQa"q2���#B��R��$3br� %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz����������������������������������������������������������������������������������� �����

My code was working before on another server...

What could be the reason for that ?