We use TFS online all the time. We had noticed that StackRank column is also
missing from some of the forms. While you can include it to see what the values
are, you will find these values change as TFS online uses that field now for
internal ordering of backlog items.
Quite painful for us
Thanks Paul.
David put me in touch with Grant at Microsoft who was able to determine
that it had been removed and he put up a notice (
http://blogs.msdn.com/b/vsoservice/archive/2014/07/08/issues-with-visual-studio-online-stack-rank-field-on-task-work-items-7-8-investigating.aspx)
to that effect.
