Proxy Access rules filtering more than I want

[juancruz.mluquez]

Hi All, this is my first post!
I'm new on Zentyal and I'm implementing a server gateway, proxy cache and some filter rules. Everything works great but the Proxy Access Rules that I added with a Filter profile is filtering more than I want. I created a "very strict" Filter profile with only "adio/pmeg" MIME type not allowed but is filtering some other MIME types like text/html or text/xml and some times Im not been able to access yahoo or facebook and I don't want to filter those kind of site.
¿what am I doing wrong?

Thanks in advance for your help!