I second Lee's opinion that you should contact DHR. It is fantastic and cheap. You pay a minimal fee (like $25 or something) and they will reveiw your case every 18 months and file for a modification if necessary, they do an IWO with your ex's employer and keep up with her when she job hops, you can go online and see payments, you can call the 800 number and hear payment info. Now if only they'd get direct deposit....

Best of luck!