Problem opening FDF files with Acrobat and Safari

Hi,

When I download a FDF file from a website, Safari opens it, which in turn opens Acrobat Professional (8.1.2), then a Security dialog appears asking if I want to allow access to the site. If I click yes, then another dialog pops up asking the same thing. If I tick Remember my action, and click OK, then Safari and Acrobat start flashing quickly until Safari crashes.

Does anyone know why this happens, and what do I need to do to resolve the problem, either with Safari, Acrobat, or on the server?

Thanks,

Joris