After upgrading to version 2026.1.211.462 of Telerik UI for ASP.NET AJAX , we are having a problem with the LoadSettings feature of the RadFilter. It is generating this error for any existing filters. We can delete and re-create filters and it seems to be find going forward but we have dozens of existing filters that will not load.
Unexpected character encountered while parsing value: . Path '', line 1, position 1.
1 Answer, 1 is accepted
Hi Jennifer,
The error is most likely due to changes in how RadFilter persist and deserialize filter states. For security reasons, support for deserializing filter states saved with the older .NET BinaryFormatter or LosFormatter)have been removed. As a result, filter states saved with previous versions cannot be loaded and produce errors like the one you are seeing.
You can find more information and workaround for the issue in this feedback portal item.
Regards,
Vasko
Progress Telerik