I'm developing a WebPart for use in WSS3 that uses the RadTicker control. I have followed the instructions here
Anyway, I found the culprit piece of code to be this:
ScriptManager scriptManager = ScriptManager.GetCurrent(
Removing this stops the error in SharePoint, but of course it gooses the operation of the WebPart. It looks as though the scriptmanager is overriding SharePoint's own scriptmanager (although when I check the current scriptmanager while stepping through code, it is empty). Any ideas what could be causing this problem?