Unless something has changed since November 02....you CAN use your mugs at other resorts.
Since we purchased mugs from ASMu back in 97...we have Coronado mugs, DL mugs, PO mugs and POR mugs....
Every year we go we always bring mugs from previous trips.In November I used a mug from CS that was purchased in 98. No problem.
So I tend to disagree that you CAN'T use them. Now, if you go to a CM and say.."I have an old mug, can I use it?"...I think they will say NO to get you to buy a new one.
I have NEVER been confronted while using an old mug. Trust me, we have 12 of them.
We even bring old mugs for our family members who meet us there. NO PROBLEM.
Like I said above...UNLESS something has changed since November 02. Then I am wrong.
Last year the big topic was "bar codes" on the mugs. I have not heard any talk of bar codes recently.