The IMPawards plugin hasn't worked in at least a year. I don't know why it's getting no love. The Amazon plugins were fixed not so long ago. I don't know what the problem is now, but I don't really care. It's posters aren't significantly better than those already available at IMDb. I explained
here why I believe modifying TMDb plugin to get just the default poster (instead of all of them) would be the best solution for posters. Since the time available to maintain poster plugins is obviously limited, I think it would better to spend it on TMDb and abandon the rest.
I wait a bit...and then PVD "blinks" like it is done, only it didn't add anything.
The AMC plugin works fine for me. It's not very fast, so 1400 movies would take a while. In testing, it did stop to ask about a duplicate movie, which seemed odd since I was importing to an empty database. But when I answered that dialog, it finished and displayed the results. Is it possible the same happened to you, but the dialog was hidden behind the main window? Also, did you check the plugin configuration to ensure the fields were properly mapped? This could also have been the problem with the Excel and CSV plugins.