Many users would like to change the default size of the triangle tag within Autodesk Design Review 2009; in most cases they are looking to increase the font size. Which would result in an incorrect display like this:
At this point, the font height has to be set to 12 pt or smaller, in order for a 2 digit number to show correctly in the default sized symbol - correctly looking like this:
To confirm - the default default size of the triangle is not adjustable at this point - not manually or through the API. The only known workaround is to modify the triangle by dragging out the handles, once the callout has been created.
We are looking into improving this feature in a future release.