New and Visio 2013 issue

[mapatton]

On a project where Visio 2013 is what is provided on the client's machines.
Building an Org Chart using Excel data. Total about 26K rows divided across 8 business units.
Uploading the data and diagramming with links is no issue.

The data though is in a state of flux. As the Excel sheet is updated, I refresh the data (this particular sheet is about 2k rows), I cannot get the diagram to update (using a discreet position ID as the primary as the names associated with the position is the item in flux).

I subsetted those 2000 rows down, and the diagram updated no issue.

Thoughts?

Thanks
Mark