I have a few like this. At least we know what happened with the loans/notes with failed payments. These with no failed payments or BK's leave us wondering. I have actually wondered if the Prosper computers have a glitch, and these loans just dropped from the system. Makes you wonder... 
I now have an AA which has made 30 automatic payments, and now is >15 days late and no automatic payment was attempted in November.
If I were Prosper (and were evil) and wanted to trick newbie lenders into thinking collections had teeth, I would "forget" to do the automatic pulls on some solid loans, then ship them over to collections. Amsher contacts them and "What?! I have automatic payments! They didn't....oh, they didn't. OK, what's the address and the amount I need to write the check for?" and then the account gets brought current.
Future blog post: ### late loans were brought current last month, compared with only # last month. See, we're doing something about collections.
Doesn't cost Prosper anything. Amsher's happy--they get 17% of what should have been a routine automatic payment.