I'm using Inkscape 0.91, and I haven't noticed any problems before importing clients' Illustrator files until recently: In noticed that they're slightly scaled up and they've been grouped into a container with a transform matrix like this:
matrix(1.25,0,0,-1.25,0,11760.125)
However, if I remove the transform, it's closer to the clients' layout dimensions.
My clients also say they're not putting their vectors in any type of containers, so is this likely an issue with Adobe upon export or Inkscape upon import?