Let’s try this:
1. Launch AME while holding the Shift key. This is the best way to clear your prefs.
2. If that didn’t resolve the issue, try moving the following file to your desktop and relaunching:
/Users/username/Library/Preferences/Adobe/Adobe Media Encoder/7.0/batch.xml
If that didn’t resolve the issue, answer these questions and we’ll go from there:
1. Did anything change on the system between when it worked and when it did not?
2. When you say you tried to drag them in to AME, was that from Premiere Pro or Finder?
3. Are you updated to the latest version of AME?