Shoutbox

Hello, first : I'm french so escuse me to the mistakes.. which I may will make..

So..
The first day when I've installed the script, it worked but since sometime, it doesn't work normally:

As soon as I use the script, what I wrote fades.
So I want to know, what can I do for the script worked normally.

Please tell me because I know an other person who have this problem too.

Thanks for the help which I will have.