Mac app store still doesn't work properly

Hi any concern,

Thank you before,has been almost 3 week.Yesterday I did Re-install OS X take almost 20 hours and then restart automatic around 6 am.But still when I click (update),(Install),(get) or any buttons doesn't work at all this happen on Mac App Store.On ITunes was Ok.I check on Console:

4/17/15 7:31:08.503 PM com.apple.WebKit.WebContent[567]: ERROR: ITSExceptionHandler: {message:"TypeError: 'null' is not an object (evaluating 'document.querySelector("#header").addClassName')", url:"https://se.itunes.apple.com/htmlResources/2A05/da-storefront-autoinstallations.j s", lineNumber:"376"}

4/17/15 7:31:14.489 PM com.apple.WebKit.WebContent[567]: ERROR: ITSExceptionHandler: {message:"TypeError: 'null' is not an object (evaluating 'document.querySelector("#header").addClassName')", url:"https://se.itunes.apple.com/htmlResources/2A05/da-storefront-autoinstallations.j s", lineNumber:"376"}

4/17/15 7:34:16.802 PM Final Cut Pro Trial[576]: The function `CGContextErase' is obsolete and will be removed in an upcoming update. Unfortunately, this application, or a library it uses, is using this obsolete function, and is thereby contributing to an overall degradation of system performance.

4/17/15 7:35:18.194 PM WindowServer[89]: Warning: Program "Dock" posted a mouse-down, blocking hardware events, but did no further mouse activity.

Please any idea?.Thank you