[Plugin: Custom fields] Custom-Fields does not save information

Hi,
I am trying to create a template in which every page can have a different header image, background image en foreground and background colour.

After a search of whats seems to be years, I found Custom Fields, a plugin which seems to be good for me.

Setting the different fields works perfect! The problem is, the plugin does not save the information I give it on the edit page page.

Do you have a solution for this?
Thanks,
Irian