I think i found the "error"!
In xml 3.7.2 for example:
#head_t_bg { background: url(/designs/radio/big/radio_04.jpg);height:65px; }
in xml 3.8 for example: #head_t_bg { background: url(/forum/designs/radio/big/radio_04.jpg);height:65px; }
I created a directory called forum and copied the designs folder in it. Now, all icons and graphics are shown.
mfg Cosmium