This is, most likely, caused by some CSS rule on the page, since things seem fine in the RadEditor demos: http://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx.
Thus, I advise that you inspect the textarea in your browser's dev toolbar and see what CSS rules apply to it in order to add your own that will override them and provide the desired font size. It could be something like
I also feel obliged to note several important things:
- we do not support DNN integration
- DNN have a lot of custom code on top of RadEditor. Thus, it is best to ask their support or community for help related to issues in the DNN environment.
On a side note, I advise that you post your questions in the relevant product forums. In this case that would have been the RadEditor for ASP.NET AJAX forum.
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