I had the same issue this morning. (I'm at the 180-day mark before our arrival date with a DVC point reservation.)
The on-line system did let me make a reservation for our first day. However, when I tried to make any reservations further out, it requested my resort reservation, which when inputted resulted in the following error:
We were unable to confirm your resort reservation. Please check the details of your reservation and try again, or call the Disney Reservation Center at (407) WDW-DINE or (407) 939-3463.
I ended up calling in at 7 a.m., and was able to make all the reservations I wanted. (I was dialing at 6:59:58 a.m., and had a 4-minute wait after getting through all of the prompts.)
Interestingly, the CM could not get California Grill at first, and started to tell me that sometimes this restaurant is on a strict 180-day reservation cycle instead of 180+10 (which is contrary to my previous experience). Anyway, I asked for Narcoossee's instead as a backup, and the CM got a "no availability" for this restaurant as well! Then the funny part--the system suggested California Grill as an alternative.

So after all that, she was able to make the CG reservation.
All of my reservations show up online, too! The only anomaly there is that the CG reservation is listed under our home phone. The rest are listed under my cell phone.
No Hoop-Dee-Doo availability, though. It's reportedly going to be undergoing a refurbishment starting in August 2012.