Added styles not utilized by DirectRT

I've added a style (number 11, if that makes a difference) to the drt file in the same directory as my input file. And in text files I've attempted to use this style by placing, "<11>", (not including the quotes) on a line before the line with text I want to apply this style to. However, DirectRT doesn't seem to recognize that I'm using this new style; rather it continues to use the style previously specified in the text file.

Is there another step I need to go through to get this new style utilized in my protocol?

Can you post a zipped sample? A simple one with an illustrative input file, style file and a sample text file?