If logged i as an administrator, you can go to admin panel (first button at top) and then choose "Export" where you need to click on Full Export, the radiobox above the one that is chosen by default. Remember, that for an import the default name is 'export', so to not have to alter that you should choose that as the name for your export.
Sorry, I completely overlooked that change! It is the same with 3.2 Community. Maybe this comes in temporarily because of a refactoring of that option? Because the used filetype is a renamed zip, this may impose problems on files larger than 2 GB. Just speculation, though.