Could you please check whether you are using the ReadAllAtOnce option for loading documents in RadPdfViewer in your application? Due to some internal changes in the control the option causes some inconsistent behavior in the most recent versions of RadPdfViewer and if this is the case I'd suggest using ReadOnDemand instead.
If you are still facing difficulties please open a support ticket and send us the document as forum posts only allow attaching images.
Let me know how it goes.
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