Lisa,
The coordinate system is usually applied to the feature dataset (and all features within) that is created when you generate the first georas layer or when you generate all of the layers.
I would recommend checking to see that the active data frame you are working in has the appropriate coordinate system assigned before you actually begin working with georas.
In regard to only the river being in the “Create Features” tab, check to see that there is a layer template setup for the other features you are trying to edit, sounds like that would be the XS and possibly the flow lines.
Let me know if it works out.
-John R.