Version 2.5.1 of WordPress is now available. It includes a number of bug fixes, performance enhancements, and one very important security fix. We recommend everyone update immediately, particularly if your blog has open registration. The vulnerability is not public but it will be shortly.

In addition to the security fix, 2.5.1 contains many bug fixes. If you are interested only in the security fixes, you can download these corrected copies of wp-includes/pluggable.php, wp-admin/includes/media.php, and wp-admin/media.php. Replace your existing copies of these files with these new copies.

If you download the entire 2.5.1 release, you will be getting over 70 other fixes. 2.5.1 focuses on fixing the most annoying bugs and improving performance. Here are some highlights:

* Performance improvements for the Dashboard, Write Post, and Edit Comments pages.
* Better performance for those who have many categories
* Media Uploader fixes
* An upgrade to TinyMCE 3.0.7
* Widget Administration fixes
* Various usability improvements
* Layout fixes for IE

New admin UI on WordPress.com, 2.5.1, and 2.6

1) The image uploader has promise, but is slow and buggy at the moment. One odd element is how, after uploading an image, the options to add a description and insert it into a post vanish. You need to hit “Save all” then go to the Gallery tab for them to re-appear. Given how slowly the whole thing runs, that can take almost a minute.

2) The check boxes for choosing categories should be moved back to the right sidebar. I often forget to add categories now, forcing me to edit posts in order to do so after the fact.

3) Scheduled posts should show the time for which they are scheduled, on the Manage Posts screen

4) Another bug I get sometimes is that comments are closed on new posts. I definitely hadn’t scrolled down that far, until it became necessary to edit the post so comments could be made.

The caches should clear every few hours, at the longest.

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