First, you are NOT using iOS 7.0.6 on a Mac Pro. You are using Mac Os X, probably OS 10.9.2 if you just updated. This is important because we can not help without the correct system info. Now to your Font issue.
If you are referring to font size on your desktop: In the Apple menu at the top of your desktop click on View.
In the dropdown menu that appears click on Show View Options. Adjust in the window that appears.
You size Fonts in applications from within the application.
Also, it is not unusual for an update to change your screen resolution. Go to System Preferences>Displays,
click on the Scaled button and select a different resolution. The higher the numbers the smaller the resolution