Here is Wordpress 3.4.2 (
http://wordpress.org/download/)
Many issues were fixed including the following:
- Fix some issues with older browsers in the administration area.
- Fix an issue where a theme may not preview correctly, or its screenshot may not be displayed.
- Improve plugin compatibility with the visual editor.
- Address pagination problems with some category permalink structures.
- Avoid errors with both oEmbed providers and trackbacks.
- Prevent improperly sized header images from being uploaded.
http://wordpress.org/news/2012/09/wordpress-3-4-2/So the upgrade is recommended. The version 3.5 is at work.