I have been having issues with Layout 2015, most recently trying to export dwg files. I converted the imported sketchup models to vector and tried just one page at a time. Layout just crashes. Tried paper space and model space options.
On a side note, when I first open up Layout it asks if I want to upgrade to the new version, yet I have the new version.
I have SU 2015 Pro, the 2014 Pro version is still installed on the desktop.