Hi Laura Edwards,
We have not encountered such an issue before.
However, RadRichTextBox has a property IsSelectionEnabled and if you have set it to False, you won't be able to select and copy text from the document. The value of this property does not depend on the value of the IsReadOnly property, so unless you set it explicitly, there will be no reason why selection will be disabled.
If you don't manage to resolve the issue, we would appreciate a sample demo illustrating the problem, so that we can assist you further.
All the best,
the Telerik team
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