ArcGIS labels
From Wildsong
There is an "advanced settings utility". I never knew about it until today. It's been around forever (since 8.x)
http://support.esri.com/technical-article/000002834
It is supposed to cure a stupid problem, labels rotate with the data frame rotation when I have never wanted that!
Unfortunately at 10.4 it appears to do absolutely nothing, so now I am trying to dig my way out with python and dataDrivenPages.