This is a minor one but should be fixed.
If you exit Quicken it should remember both that it is maximized and what the size and position was before it was maximized.
To illustrate this, take your web browser and start in a normal windowed (not maximized mode).
Now maximize it and then close it. Now open it again. It will start maximized. Next select the "Maximize/restore down" icon to go back into normal windowed mode. You will see that it goes back to the size/position it was before you maximized it.
Now repeat this for Quicken Windows. What you will find is that Quicken saved the "windowed size/position" as the full screen. In other words, when you select the "Maximize/restore down" icon after opening Quicken the second time, it will appear like it hasn't left maximized mode. But it has, it is just that Quicken Windows has "forgotten" the normal windowed size/position (by overwriting it with the size it was when it closed in maximized mode).
This tends to be minor because people usually either always work in windowed or maximized mode, but it really shouldn't work this way.