Image upload re-sizing does not works

Hi every, I've notice a problem with my OC. My store is configured as follow:
* Category Image Size: 80 x 80
* Product Image Thumb Size: 228 x 228
* Product Image Popup Size: 500 x 500
* Product Image List Size: 80 x 80
* Additional Product Image Size: 74 x 74
* Related Product Image Size: 80 x 80
* Compare Image Size: 90 x 90
* Wish List Image Size: 47 x 47
* Cart Image Size: 47 x 47

But surprise when I upload a new image and attache it to any option (Catalog > Options) I only get 50x50 and 100x100 under /image/cache/data, why? How I can force the 228x228 image creation?

Cheers and thanks in advance