TFS 2012 web access 'b' is null or not an object error on the product backlog board

If the user clicks on the board tab on the product backlog,  the first time the board renders without any issues.

Check to see if you are using IE8 or below for TFS 2012 web access.   IE8 is not supported. 

Microsoft Test Manager 2012: Create new Environment errors on validation

When the user tries to create a new environment and the validation times out.  Please check to see if the Team foundation server background service is running.

The Environment validation gets queued in the database and the Background service updates that information once it has ran.   So the table to check in the tfs_defaultCollection database is called dbo.LabOperation which is the queue and holds the status of the items.

select * from dbo.LabOperation

Hth.