We were experiencing issues in our trade posting process during EOD on 11/03 due to network timeouts. As a consequence, roughly half of the trades from yesterday were missing from our books before closing the day and got only booked on the next day (11/04) in our book keeping system. This led to inaccurate balances on some of the accounts in the timeframe of 2:15am - 4:30am ET, since the cash balance calculation was mistakenly ignoring the trades that were only booked for the next trading day.
To prevent such issues to happen in the future, we are planning the following actions:
Client's balances and buying power may still be incorrect. In particular, buying power will not be correct for many users until batch runs overnight.