I have recently moved to using ATE on an existing site and I am looking at enabling the Media Translation plugin. I was trying to go through the configuration phase for existing content (under Settings -> Media Translation -> Start), the translation phase is done ok but then for duplicating content a huge number of items if shown (250.000) vs the real number (10.000).
The process starts but times out after a while given it would take ages to complete with 250k items, which don't exist. I have tried to do some troubleshooting (Clear cache, remove ghost entries, etc.) but that doesn't seem to have helped. I haven't gone through everything though.