When reviewing my checking account I always have it set to Show All Dates (Transactions) by default, for no particular reason. I must have accidentally clicked Year To Date, and all of a sudden my balance column was off, increased by around $63,000! After realizing the filter was on I started playing with it: I found the more compressed the time frame, the more the balance was off. Setting it to Last Quarter, or Last Month, would increase the balance by around an additional $110,000. Go back to All Dates would return the balance to the correct (modest) amount.
I checked the filter options on numerous other accounts - savings, credit cards, even from the same institution, and they all seem to work fine - no weird balances.
I'm no power user, but have used Quicken for decades and have not ever run across this issue. What's going on?