We have a problem with our TFS 2013.
We are trying to set up our Taskboard. Unfortunately, the taskboard is only showing workitems with the state New, Committed, and Done. But workitems with the state In Progress aren't showing up.
Does anybody know a solution for this? Do I have to add the state In Progress somewhere in the process template?
Our process template is „Microsoft Visual Studio Scrum 2013.4" and we customized a few things in it.
Here's a screenshot of what I meant to describe:

There are no default "In Progress" state of the workitems created in backlog. Seems you have customize it and add this state.
If you want this workitem with "In Progress" state also shown in the task. You should also customize your backlog
Then add a value such as below:
You may need some restart after the changing, more details please refer this link: Map WIT category workflow states to metastates