I decided that I should push on and try and create scenery using SDK for the experience and education if nothing else BUT...
This window does NOT open/display after I select CREATE NEW PROJECT (where the empty folder is selected to write the files to and the Project Name is entered) as it does in mamu's video tutorials.
I have watched the video many times and also ensured the folder selected is empty many times. Cannot understand this.
View attachment 78666 <<<<<< this does not appear after I Create New Project
Not sure if this matters but I continued on and added a polygon when after a few retries was able to select Terraforming in the Properties window without the window going blank as it did the other day - the method was to double mouse click on second line showing 'polygon' in the Scenery Editor which then also sets the camera into top down view and enabled selection of the terraforming 'parameter'. This is diffeernt from how mamu achieved the same thing.
Anyway something else I have learned and achieved.
Well I now need to know what Rhumbaflappy (Dick) did to the 'elevation' (Y axis) when he created his terraforming polygon. Did he leave the altitude alone or drag it higher or lower? Does it matter in this case (ensuring there is no abrupt level in the water)?
And there's something else. When the elevation is changed (Y axis) it displays the change which then becomes 0 if the user goes back to make changes and so he needs to remember how far he dragged on the Y axis if he wants to revert to the original height. Surely there is a way to reverse the action more easily?