See
http://wordpress.bytesforall.com/?p=93
- With the new WP3 menu system
- Export/Import system now uses the JSON format instead of the serialized/base64_encode format used in 3.5.1
- The reason for the change is that Wordpress.org won't list the base64_ version due to the malicious things often done with base64. Sorry I should have thought about that. base64 encoding the settings files seemed to be a quick fix for the issues many users had with the settings files.
- Unfortunately this means that if you exported a settings file in 3.5.1 and want to import that in 3.5.2, you'd need to do some legwork: Download this zip file, extract it, rename the "uploadBASE64.php" to "upload.php" and replace the existing "upload.php" in Atahualpa 3.5.2 with it.
- If you don't have old settings files that you want to import then you don't need to do the steps described above
This release was mainly about the new WP3 menu system and the change of the settings file format. I will add the bug fixes that Juggledad posted, in the next release