When I add file and click "combine files", after the first one, it does not respond.

I have tried uninstalling and reinstalling the whole suite. I tried just uninstalling and reinstalling the Acrobat. I tried different files. I tried making them PDFs first. I enabled security. I added the registry key noted in a forum in this area. I changed my browser.

The issue persists. Tech Support at the institution can not find a resolution either.

I'm re-entering the question as it was cleared previously.