Well, I never was able to get that trigger to work. However, I found another way to do it: event notifications and the Service Broker. I created a Service Broker service which will respond to the DDL groups. I may write an article on how I put all this together, since it took me a long time to figure out. It's working pretty well, as it is auditing all DDL events (except for the create statistics one, since I don't really care about it) into a table. So far, it looks like I've got the solution.

Thanks for your help!