In :

Preferences class>>listOfCategories

the Preferences list of categories is different on the UIUC FTP version than
a manually updated image. In particular, the entry key value

'halos' in the list on the FTP version should be #halos

If halos is not a symbol, then the preference panel does not present the
radio buttons to change the icon types 'iconic', 'classic', 'simple' or
'custom'. In addition the option to 'edit custom halos' button does not
show.

Jim Benson