I have seen a couple of threads go by.
Mine was terrible this morning. For my Merrill account, it was off by over $10,000.
What I then found is that sorting by 'Date' has an extremely unusual behavior.
If you have the newest date at the bottom, it all matches with the 'Cash Balance' in the lower-right corner. If you have the newest date at the top … well the data in the 'Cash Balance' column is just garbage.