You may have encountered issues with running preview of Series 40 web apps and Symbian WRT widgets in the version of Nokia Web Tools for Windows.
This is because Web Developer Environment needs to be run in administrator mode for web app previews to open in Web App Simulator. You can now resolve this issue with a patch that is available at http://tools.nokia.com/wt/patches/1.....2.0_patch.zip.
Simply install this patch onto your PC and the next time you run Web Developer Environment you can do so without having to run it with administrator privileges. For more information on the patch see the Nokia Web Tools release notes at http://tools.nokia.com/wt/notes/1.2/release.html.