Mitchel,
Other than making sure your interface MTU's /ospf network-type is set the same I can think of only gathering "debug ip ospf adj" from your cisco router which might show us what is keeping your router and Ascend box from going into a full state (if this is even the issue). If you can shed somemore light on your specific issue with OSPF between the two it might help us help you.
Hope this helps you,
Don
