The information in this article applies to versions of Internet Explorer released and updated between April 2006 and April 2008. As of April 2008, the behavior described in this article can be removed from Internet Explorer. For more information, please see Information for Developers about Internet Explorer.
Microsoft has made changes to the way that Internet Explorer handles some content in Web pages. When Internet Explorer encounters a page with ActiveX controls (such as a media player or an interactive animation), the control may require a single click to activate.
When your mouse hovers over the control, a tooltip will appear. Here is an example shown with Windows Media Player in a Web page:

In certain cases, the control will prompt a dialog box before the page loads. As soon as you click OK, the page will load normally. The dialog box will look like this:

In both cases, the functionality of the page and the ActiveX controls will be unchanged after activation.
This requirement to click to activate will happen each time you refresh or visit the Web page.
If you are a Web site owner, you can rewrite your Web pages so that users are never presented with a tooltip or a dialog box. Learn how.