Cannot Upload a new homepage image using slider

[criPresta]

I keep having the same problem everytime I need to change the image on my homepage with the Slider module.

 

It says the image has been successfully uploaded but the image doesn't show on my web (www.cricric.com) 

 

I have tried contacting Prestashop on twitter, on the add ons page and directly and I have not received a solution for this.

 

I am using version 1.4.7.0

 

Please, can anyone help?

 

Thanks in advance.