The case of the vanishing KPIs

I was contacted today with an interesting issue, we had a tabular model that had some KPIs which were not showing up in Power View. The first thing I checked was the version setting on the model. KPI support was not added to tabular models in SP1. If your model is set to a compatibility version of RTM (1100) Power View will detect this and will effectively not ask for metadata about the KPIs.