1/23/2008 11:24:27 PM
I have the same problem. I can only assume that is because some code that is run after any Web Part modification is manually adding another ScriptManager to the page without checking for an existing one.
I tried using the ScriptManagerProxy element in the master page instead, but apparently the ScriptManager element is only added after a Design -> Web Part modification, so you can not assume the existence of a ScriptManager in most cases.
I couldn't find any instance being created by the supplied CMS code (via several different Find All searches). I tried browsing around in the compiled Kentico DLLs (IL code) but didn't find it there either (although that was just a manual search in a couple of DLLs and methods I thought it might be in).
So, I couldn't find a workaround. Kentico, do you have one for us?