Wirelessly posted

Lately most sites saved in my bookmarks in the bb browser gives me an error saying a problem occured rendering the page. Lots of sites like espn, pinstack, crackberry, weather underground, etc., but they work perfectly using opera mini. Any ideas? I've pulled the battery, resent service books etc. And nothing. Called tech support too and all they said is the site probably changed the address or something, which they didn't.