Mac App Store launches with a white screen

I'm having a problem with the App Store.  I'm lance the store and do nothing else than a white screen with the spinning wheel in the upper left corner.

I can switch between the tabs, but nothing else does.  I tried to quit and relaunch the Bank several times.  I tried dumping the files of two preference of my library user (com.apple.appstore.plist and com.apple.storeagent.plist).  The activity monitor does not appear anything that is not responding.  The App Store is completely stuck, always, when I open it.  Someone knows how to fix this?

Activity monitor is now showing "Content of Web App Store (not responding)".

Tags: Mac App Store

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