Can’t Drag Widgets in Wordpress 2.8

If you can’t drag widgets in the widgets admin panel, most of the time, the cause of this problem is wordpress plugins conflicts.
You can deactivate all the plugins first to check if the error is caused by the plugins.
Also I have meet this problem twice, and both of them are caused by the wordpress plugins, deactivate all the plugins, then I can drag widgets to the sidebar.

1. Not all plugins currently work with WordPress 2.8. If that’s a problem for you, I’d suggest contacting the individual plugin developers for an update.

2. Just one incompatible plugin can stop other plugins (and a host of other Admin functionalities) from working correctly. And I’ve known it take days for the effect to manifest itself. It’s not just about deactivating/reactivating. It’s about deactivating all plugins, then checking to see if this resolves the problem whilst the plugins are still deactivated. If it does, then activate the plugins one by one – checking problem areas/issues after each re-activation – until you find the culprit.

Hope this can help you solve the problem.