Check your settings under Gameplay. Do you have the Planning Mode Camera checkbox checked? Try unchecking or checking and see if that helps. It's kind of a long shot, but the only setting in-game that might make a difference. Double-check your display settings - right-click on the desktop, choose display settings, and make sure that under scale and layout you're not changing the size of text and apps. Also, are you running in compatibility mode? Double-check the properties of your SimCity icon and Origin icon to be sure that you haven't inadvertently checked any of the graphics settings under the compatibility tab. It's strange that changing the resolution doesn't change the toolbar size - it should.
You recently reinstalled the game - what OS are you running? what graphics card?
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