With the new GI BILl, there has been crazy times restraints on the VA. So everything has been slowed to a crawl However get on the phone and talk to the VA. Let them know what is going on. First check your schools va office.
Sometimes it is required of the school to call the VA to start the loan every month. So you have to stay up on the school, so they can assure the VA you are attending classes and passing.
Long story short, get on the phones and start calling for your money.