I've just installed build 3016 Pro Edition 64 bit and trying to have a go with the River Device(s) but I can't seem to get any output from them whatsoever.
I've looked at the example projects (which seems to build with rivers fine) but in a new project, even I just do a simple device setup I can't seem to get any rivers, e.g. Add an Advanced Perlin, Erode it into a respectable shape, add a River Reach Device (with or without River Character input) - all I get is just 'black' output, no river defined, no changes in height map or values coming out at all.
Am I missing something fundamental here? I've done some googling searched through the forums but I can't find anything beyond the Example Projects that give any information on how to use the River system.