Sounds like you've dealt with this before, so you know the drill on removing the DTI card in reverse of how you would install one...?

Re-install the DTI card. When you un-program it, make sure you remove all the channels in 1-11 for all 3 slots.

How many phones on this system? If it still won't let you re-assign the card, how much of a headache to initialize and re-prog from scratch? Couldn't possibly take more than a few hours. Better than spending 4 or 5 hours letting it get the better of you maybe??

D