When you visit a webpage that contains widgets on a Windows 8.1 preview-based devices, Internet Explorer 11 Preview freezes or crashes when it is loading the webpage. For example, it freezes or crashes when you visit a webpage that contains a weather report widget.
The issue occurs because incorrect values are assigned to properties of a RegExp object when Internet Explorer 11 Preview performs regular expression pattern matches. These incorrect values result in incorrect functional behavior of the webpage, and cause Internet Explorer 11 Preview to freeze or crash.
To resolve the issue, install update 2866512 from Windows Update.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates