MATLAB: Command window not refreshing

MATLABnot refreshingwindow

I've been using R2012a on a Mac with OSX 10.8 for at least several months now without issue, but today on starting Matlab I found no windows would update until I resize them; i.e. I can type into the command window and see what I've typed only after resizing the window. I've just tried reinstalling matlab – no luck. Any help is really appreciated!!
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