Cant change and regenerate category "home" image?

[q-skins.dk]

Hi all.

 

I am running this website q-skins.dk, and right now i have had a company analysing my site, and now i am completing the changes they told me to do. One of the change is that i have to change the product category images which is 129px x 129px at the time, shown on this page (http://q-skins.dk/19-ipad2-cover) to 240px x 240px, which i can do sucesfully in preferences--> images--> home. problem is that i cant regenerate the home image and then get a perfect scaled image, after the scaling and regenerating the images get foggy or what you call it.

 

I have reset the cache and compile, but that did not solve the problem.

 

Do i have to change anything in some of my css or tpl files? or what caused this problem?

 

hope somebody can help me.

 

Thanks in advance.