Cannot Maxmize Quickbooks 2013 Window

I had a customer who had recently upgraded to Quickbooks Pro 2013 and could not maxmize the Quickbooks window.  He used a laptop with windows 7 and an external monitor, with the monitor having a higher resolution than the laptop monitor.  When he would maximize on the external monitor, it would leave about a 2 in gap at the top of the screen and if he maximized on the laptop screen, it would maximize with the same gap but the window would extend below the taskbar.  On a hunch, I checked the Windows screen resolution settings.  He had the monitors aligned so the bottom of the screens was matching but the tops were offset a bit.  I matched the tops of the monitors and applied the change and was then able to maximize the window on either screen.  You can get to screen resolution settings by right clicking on the desktop and choosing screen resolution from the popup menu.  From there, drag your monitors so the top of them are lined up and the bottoms are offset (one monitor will go lower than the other) and hit apply.  This should resolve the issue.