Still no icons at the top of my lister. I checked to make sure the directory locations were correctly pointing to the icons, and all was well. Not sure what's up. Might I need to install NewIcons in MorphOS?
I don't think you should install anything. When you are editing the lister toolbar and on "Image" line where path is defined, if you click the drawer icon to open file requester, does it go to correct place and what happens if you reselect the wanted icon image?
And as you talk about NewIcons... do you have Dopus setting Environment->Icon display->Enable newicons set? I don't think it has anything to do this, but just in case.
Also when I right click on a listing, it now scrolls down instead of bringing up the list of options like it did under AmiKit.
Check Environment->Lister Options->Name Mode PopUp.
The ambient icons do not display correctly in the Dopus lister, but I can use them. What they display instead of what they are supposed to is a box that says Ambient PNG.
I never use dopus listers in icon mode anyway

You can execute programs in icon mode with qualifier key from name mode, so you don't have to switch the mode for that either.
But I have also made a button in my dopus lister toolbar which opens current directory in icon mode in Ambient window. I guess that could be useful for you too for viewing all icons. Add a button to your toolbar with function: open {s}