crystal report client side

Hello all,

I've got a problem with my crsytal report.
Actually iI display a crystal report in a crystal report viewer, that works very well on my development machine which is my web server too (web server used is IIS).
But when I want to consultate the report from another machine ( a client machine) the report doesn't work:
the report is loaded, I can see the toolbar and the tree, but the graph can't be loaded and displayed.

I primary thought the problem was a bad dll, but finaly I think the problem is due to a access/permissions configuration.

If someone can help me...

In advance thanks.