Thank you for the additional exhalations. I see the url always starts with Default/... .
You say you have the same settings in other sites and it is working can you compare the API apart and the sites web.config to see if there is some url rules that specify this.
If you have url rewriting in IIS or <urlmapping> in web.config some of the url rules may ignore your initial rule.
Can you provide additional information on the case like how you use Telerik.CmsContext.CurrentUrl or web.config.
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