Internet Explorer 7 Beta 3 freezes if you already have the Internet Explorer Developer Toolbar installed in Internet Explorer 6.

The Problem

Only the newest version of the Internet Explorer Developer Toolbar runs correctly in Internet Explorer 7 Beta 3.

Developer Toolbar and Internet Explorer 7 Beta - The latest version of the Microsoft Developer Toolbar runs correctly with Internet Explorer 7 Beta. You can download it from the Internet Explorer Download Page. Previous versions of the Developer Toolbar do not display correctly on systems running Internet Explorer 7 Beta and sometimes cause Internet Explorer to hang.

Release Notes for Internet Explorer 7 Beta

The Solution

If you had the Developer Toolbar installed in Internet Explorer 6, and you then installed the Beta version, you will most likely need to uninstall the Developer Toolbar and install the newest version.

Internet Explorer Developer Toolbar