@pintadrew 

Try running a SOCF through today.  Then, double-click on the amount next to "Cash at beginning of period".  That pulls up the Transaction Detail by Account report.  On the 'Total by' drop-down, select 'Total only'.  That should then organize the report by date so you can see your cash balance since the beginning of the business.  AFAIK, that's the report that QB is using to determine your cash balance at the beginning and end of the period.  See if you can find the $650K, $100K, etc. there.