aceflor: A couple of things to check.
- Update to latest calibre (0.6.37) if you haven't already
- Check Preferences|Conversion|Page Setup|Output Profile, make sure you have 'Kindle' or 'Kindle DX' selected.
Rebuild your catalog and send it to your Kindle. If you're still not getting the
Sections... option, post the log from the build (see first post in this thread for how-to)
G