Hi FrankieV
I already have a fix for this which i submitted to Epic games tonight. Sorry that i missed this when I submitted the most recent fix. But this should take care of all of the problems and we should have a pretty stable pack at this point 
Until the pack is update (I submitted a version 4.9.0 also btw WOO!!!) Here is a fix on how you can get the river scale working again.
Open up the “master_river_spline” under the “Spline_BluePrints” folder in the nature pack. Then follow the instructions of this picture. The pack should be updated shortly. Thanks for your patience!
