Mac App Store opens to blank screen; cannot switch between menu options Today I tried opening the App Store to update some software, but when it opens I am left with a blank screen:



Also, when I click on the menu items in the top bar, multiple items will highlight in blue (but the blank screen will not change):



Does anyone know why this is happening? I am using Mac OSX 9.1 (Mavericks).
I killed all store* processes in Activity Monitor. Then relaunched App Store and it started working.