We've made a change in 2015 Q1
(listed in release notes as "Setting value to the bound property of a DataProvider can fail silently."), which basically adds one additional null check to reveal some situations which were previously failing silently.
I was not able to reproduce the problem locally, but I believe that in your setup something is preventing the normal automatic registration of the TxtFormatProvider (RadRichTextBox uses MEF
). You can manually register it by putting the following code somewhere before the XAML initialization:
In case this doesn't help, you could open a support ticket and send us sample project reproducing the issue - this would help us investigate it thoroughly on our side.
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and share your thoughts.