We have some browser enabled Infopath 2007 templates hosted on Windows Sharepoint server (Windows 2003 machines). We use a couple of 'Rich Textboxes' in these templates and these templates are made available to the end user via .Net windows application that used the WebBrowser control.
The application runs just fine, but only on 64-bit machines with 64-bit Vista installed Javascript exceptions are being thrown ("Stylesheet" is null or not an object OR "body" is null or not an object) when clicking on the rich textboxes.