I upgraded Wordpress to the latest version (2.6) last week.  The upgrade itself went very smoothly, until I went to upgrade my plugins.  There was an incompatability in the K2 theme that the site is based on which means that the custom sidebar manager is turned off everytime I went to the plugins page!  After trawling through the K2 page and forums, I have now fixed it.

For others still struggling with this problem, you need to download the latest nightly build (build number 703 or later) of the K2 theme, and upload it to your Wordpress themes folder, overwriting the old version of K2 (backup your original theme file first though).  Then you will need to copy the “k2-disable-widgets.php” file to your wordpress plugins folder and activate it in your Wordpress interface.  Go back to the Design page and make sure the Sidebar Manager it still active and you should be ok.

I kept flicking between the Plugins and Design pages a few times, and then checked the live site, to make sure it was working ok.  The problem seems to be sorted now, but it might be worth checking the K2 Nightly Changelog regularly to see if there have been any more issues.

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