Ubuntu 15.05 x64 Geforce GTX 580
Short description of error
When using vertices as input for point density and adding a modifer or changing settings of a modifier, the viewport does not update. Also when using subsurf modifier, it always uses the number of subdivisions in "render", even when in viewport preview render. See attached video:
Exact steps for others to reproduce the error
Open attached .blend - go to rendered preview mode - change subsurf settings - remove and re-add the modifier. Nothing happens. When going out of rendered view and back in, the render amount of subdivisions is used, not the view one.