[Zope] Event bug

Hi folks, Sorry to ask you such stupid question.. I´m a newbie with a weird problem. Everything was working fine with Plone, until yesterday morning. Now there´s a weird form (image attached) instead of the common form, the calendar is transparent, the idiom is misconfigured and nothing seems to make sense. That happens only when I try to create an EVENT. It doesn´t matter if I use an administrator account or a regular user account. Everything else is working fine. Any clue? Thanks in advance, Roberto Campainha --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.541 / Virus Database: 335 - Release Date: 14/11/2003