Hello Gevorg,
Did you try to disable AJAX via the OnRequestStart event? Can you try using this approach and let me know if the problem with RadAjaxLoadingPanel skin still persists? Additionally, please specify how you set the skin of LoadingPanel and verify that you are not displaying it manually.
Additionally, providing the problematic code would also help to understand the logic of your application and advice you further.
Regards,
Pavlina
Telerik
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