Has anyone successfully implemented a CMS6 R2 upgrade where site is using ONLY windows authenticatin and TinyMCE under editmode provides all functionality?  

We see problems under Internet Explorer whereby TinyMCE that (seemingly) require I/O are not functioning correctly.  E.g: web link (the button that has the link with the globe), dynamic properties, image upload.

[Still trying to resolve problem reported here: http://world.episerver.com/Modules/Forum/Pages/Thread.aspx?id=59088&epslanguage=en]