This seems to be a common problem some of my friends have experienced, even some on OSX.
Anyway the quick workaround was to just blow away your ~/Documents/maya/2012-x64/prefs/userPrefs.mel file.
However here is a better fix I came up with which does not seem to be documented:
--- prefs.old/userPrefs.mel 2012-12-04 12:00:52.029427000 +0900+++ prefs/userPrefs.mel 2012-12-04 12:15:29.213427000 +0900@@ -972,7 +972,7 @@-iv "loftPolys" 0-iv "mainMenuBarNeedsToBeTraversedWhenHotkeyEditorIsOpened" 1-iv "mainWindowDisable" 0- -iv "mainWindowMenubarVis" 0+ -iv "mainWindowMenubarVis" 1-iv "mainWindowTitleBarVis" 1-fv "manipGlobalScale" 1.5;optionVar
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