If you still have problems, hope to try again these steps,,
1 clean un-install about daz default contents for ds 4.0 too. not only aprication.
though you uninstall ds4.0 aprication, they are not auto uninstalled.(about windows,, I remember)
you should not merge old default contents for 4.0 with new genesis starter essential.(default contents for 4.6)
2 Usually Both of “start up scene” , and “new” load scene, are appointed to old genesis.dsf user scene files.
about your case,, but genesis.duf file is actuall user scene files which DIM installed. and we should use it .
if you can find genesis.duf not genesis.dsf in your contents library and Smart contents,
go to preference >> select “Scene” and “Start up” As Mike said,,,
then appoint new genesis.duf (not in data) about both (or you can select “none”, I prefered this because,
now we have gen2F too.
3 check again the “ds contents directory” for DIM, DIM install all contents there (the directory means root for your all contents
which installed by DIM) you can check it from DIM configureation setting . under install tab section.
if you did not change the default setting, it must be C:/Users/Public/Documents/MY DAZ 3D Library.
the folda should be new and empty, untill you use DIM and install contents.
4 After that you need to add the DIM isntalled directory as one of ds contents directory for daz studio CMS
by DS directory manager, So that CMS can serch and show the files in the DIM installed directory.
but if you have old default ds contents in your directory, then add new DIM directory,
in database,, they merge and cause problemes I think.
so that need clean uninstall , about contents too.
if you have still problems,
please memo both directories as full path, then show here please. it make easy to remove problem.
a) ds contents directory which you can see in ds directory manager,
(which you have used before , or added in daz studio 4.6 by your self)
b) root directory DIM isntall contents which you can check by DIM install setting ,