Any time I run "FINAL FANTASY XIV Config" and do the following:
1. Switch language dropdown to English
2. Click the "General" button
3. Make some changes (or do nothing)
4. Click the "OK" button
I get a Windows error report saying "ffxivconfig.exe has encountered a problem and needs to close." None of my changes are persisted.

This is pretty annoying, as I hate playing in windowed mode. I'm assuming my system specs would be useful, but I'm not sure how to submit them.