Here’s an enhancement you may want to consider implementing.
When you click on a Category checkbox like Housing:Com Ed (in my case), it highlights the transaction shown in the calendar for this category which is fine.
However, let’s say for example, you have 10 transactions for January 7th and one of those is the COM ED – Electric Bill transaction which is the last transaction for that day. You won’t see the highlighted transaction for that day even if you are in the regular or full screen mode. I’m using Chrome on Windows 8 Pro. If this is the case, my suggestion would be to highlight the ending day balance line for that/those specific day(s). This way the user would at least know that/those specific transaction(s) occurred that/those day(s). Otherwise, the user would have to hunt the current month for it.