I am still concerned as to what is happening here. If library objects show up in the sim but have no thumbnail then it is the thumbnail folder which is needed. On the other than if the objects appear in the sim as black boxes then it means that the information about them is not in the Library Object Manager and that means they are also not in the file adeObjectList.dat That is the file that the LOM uses to to display the information. There is another way to do this but I want to be sure that you have a clean installation for version 1.7 I assume from the previous post that you installed ADE 1.70. This is not actually the current version of ADE which is 1.76.
If you create a clean installation of 1.7 then you can import the settings from 1.65 into it which should include the data files. There are some minor issues with the import function but I think it is better that you try this than copying files and folder.
When you start the clean 1.7 then you should get presented with the new user wizard
This has an option to import settings from an earlier version of ADE. Click the button
Use the '...' button to select the folder to import from. I show the path to my version of 1.65
Also you will see a list of the different things that can be imported. I would suggest not importing the Project Settings Folder and the Lister Settings Folder - uncheck them. These are two areas which have been known to cause problems in the past.
Then click Import and let it do its work. Finally close and restart ADE and hopefully you will have data on your library objects. But bear in mind it can only contain what was in the 1.65 installation folder