I maintain several web sites for non-profit organizations. Their content changes at least weekly. After I make a change, I test it locally on my PC. Invariably I get one of several messages in yellow at the top of the screen indicating that content has been blocked. It gives me the opportunity to unblock it, which I do. Then everything is okay. It's not a biggy, but it's a pain.
When I upload the changed page to the server, no such blocking occurs. I believe it has to do with my security settings, but I haven't been able to get them right.