[Zope] Problem with 2.2.4b1

I installed 2.2.4b1 over 2.2.3, and everything seems to work fine, but, when I IE5.5 to manage my sites, I loose some icons and graphics (not all!). But, if I clear my cache, The icons reappears, but only for a while! Am I the only only experiencing this problem? Jean-François Ménard Intranet DPAS Pratiques d'affaires et orientations * (514) 840-3000 poste 3939 * (514) 840-5585 * menard.jean-francois@hydro.qc.ca * 855 Ste-Catherine est, 6e étage Montréal, Qué. H2L 4P5