Map stuck on my screen

[Cowmah]

Title: Map stuck on my screen

Version: 1_0_4

OS: Windows 7

Java Version: Version 7 Update 25

Description of Problem:

There is a cut out version of the map on my screen, I can see just around the outsides but most of my screen is taken up.

Error Messages:

Error Log:

[Joker2040]

You hit 'n', cycling the size of the mini-map. Hit 'n' until it cycles back to the size you want.