It'd be great if you could check this with Qt 5.6.1 and 5.7.0
I'll try tomorrow on my setup, when I get home.
What's strange though, I just set up another pc with a fresh install of ubuntu 16.04.1, also with the qt5-default package (which really is 5.5) from the standard repo, that i too have on my pc, and the current svp build ran just fine.