We just released a new feature available to all premium members that lets you view your end of month balances for the entire timeline of your transaction register. This feature provides both a visual and a textual view of your balances from the first transaction you added to the latest.
The visual report allows you to select certain date ranges to get a more focused view of your balances. You can also switch between 1 month, 3 month, 6 month, 1 year and All Time viewing modes. The textual table is fully sortable so you can easily figure out when your balance was the highest.
The Balances Timeline report can be found by going to the Reports page and then click on the "Balances Timeline" link under the Accounts tab.