Thank you for writing.
I managed to reproduce the described case and I can confirm it is an issue. I have logged it in our feedback portal
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TextBlockElements are dynamic elements in the control and changing properties of such elements at design time is not allowed. Most likely the element you change the Alignment to is a default element which gets removed when the control is started. Still, we will look into a way to prevent this exception.
To modify TextBlockElements properrties, you can use the TextBlockFormatting event. More information is available here: http://www.telerik.com/help/winforms/editors-autocompletetextbox-formatting-blocks.html
I hope that you find this information useful. Should you have any other questions, do not hesitate to contact us.
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