It appears that SmartPart optional support for Ajax is not optional???
The installation document says "OPTIONAL: ADD SUPPORT FOR ASP.NET AJAX".
However, it seems like it IS required or one will face the dreaded RTE...
File Not Found.
...when trying to add a WebPart into the site...
>SiteActions, >SiteSettings, >WebParts, >New.
This is a known issue, as found here...
...and found in many other areas in the web.
This is totally unworkable if this is true, IMHO.
-- Mark Kamoski