Mac app store still doesn't work properly

Question

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4/17/15 7:34:16.802 PM Final Cut Pro Trial[576]: The function `CGContextErase' is obsolete and will be removed in an upcoming update.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

Answer 1

I have followed the other discussions and done the suggested updates or deletes and to no avail.
Unless you tell us exactly what you have tried, we have no way of knowing exactly which updates or deletes? aren't working for you.
Try installing the combo >  Mac OS X 10.6.8 Update Combo
It's ok to do this even though you are already running v10.6.8.
Restart your Mac after the combo is installed, try the App Store.