reset default snaping?

[fsk]

ok the thing is:

i changed the size of my images and layout sizes but the default snaping stayed on the same width and hight as before.
i thought it had to be something with the code but its not becase when i copied the entire skin folder and loaded is as a new skin the snaping was ok.

does anyone know how i can reset it without makeing another folder? i tried unninstaling the skin but it didnt work.