I just put the *.navidadlae.terra.es as "allowed" in my private sites and it does not work either. However, I was angry about that and wanting to remove one specific allowed entry I clicked on "Remove All" and for sure all entries, blocked ad allowed, dissapeared!. Now what? I do not know what to expect now out of that wrong action.
Yes, I'm certain I have pressed APPLY and OK after modifying settings, and I have reseted each security zone individually. I just asked for help because I had done everything in IE security without result.
However, your mention to Acrobat Reader rang a bell. I open Acrobat Reader, gave it the rebel URL and eureka!, it worked. I maybe have to upgrade to version 7.
Thanks to you ALL!