I've applied everything I can find for sql 2012 management tools and mine now show 11.0.3350.0 both on my desktop and on my test server. Getting two types of errors.
If I remote onto the sql server, managing maintenance plans works fine. From my desktop I get the Object reference not set to an instance of an object with "vsintegration" mentioned. Must be something about visual studio or other software on my workstation.
When opening the sql error log viewer and selecting a Windows NT log like application, I get "the given key was not present in the dictionary"
I'm going to uninstall Visual Studio and everything related to sql server 2005, 2008 and 2012 and re-install the 2012 management tools because others here will soon run into these errors.