I've fallen a bit behind in my reading (ok, a lot behind. 
) and I was wanting to download the once I didn't have in my collection: Dungeon Issues 161 and up. (Also Dragon Issues, but I haven't started collecting those yet.)
I was able to download Issue 161 fine, but when I tried to get 162, it tossed me an error. Same story for 163, and 164.
My DDI subscription is active and paid, and I can still access 161, but no others.