Hi, just wanted to second that I also had issues with this tool when using it to create a CSV for a file with English source text and Chinese translation text. It works fine for one with English source text and French translation text, so it seems like something with the Chinese characters is causing the issue.
It can create the CSV fine, but when converting back to RPY, an error message saying "Something went wrong." pops up and the created RPY is an empty file.