Jonpfl,
The range of accepted font size values is from 1(smallest) to 7(largest).
If you want to add more bigger value, please add the following code into font size section of common.config file.
<item text="50px" value="50px">
<html><![CDATA[<font style='font-size:50px'>50px </font>]]></html>
</item>
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