I'm not sure what happened in my case, but I was very careful NOT to create a new admin account, so I was surprised when my Classic user #2 became User #4. I wrote a little php script that does an update query on all the tables and fields that contain any form of user id info and caused it to update all occurances of "4" to "2" , it seems to have done the trick and no problems so far.
Thanks,
Basil