Kik, I didn't have any trouble. I had a total of six accounts that were mine or I managed for others at TDA. And I also had one account at Schwab before the switch. Five of the six accounts at TDA moved over seamlessly... and all five were moved to a 'family of accounts' combined with the one I already had at Schwab. The same User ID and password to access all sub-accounts under one main account.
The sixth account at TDA I had mistakenly never submitted on of those 'trading authority forms' at TDA. So in essence the account 'was missing'. But I called Schwab, filled out their 'trading/account authority forms' (or the account owner did), and by the next day it was added to my 'Group' of accounts at Schwab.. I think i had to do something with the USERID and Password, but pretty quick.
best.