I guess its all of our nightmare when things go wrong.
The last few weeks have been mine.
Finally decided two weeks ago to upgrde from 2.5 to 2.5.1
backed up everything sved database files, hey presto. new blog.
From that point on, i could no longermove any of the contnt in my sidebars. I'm using a 3 column theme.
A few days ago I'd had enough of the problem, droppe the database.
And started afresh. I was pleased it was all over as the site was deleted.
Re-installed today, but still had the problem with being unable to drag anyhing to a new position in the sidebars.
I knew there must be a conflict somewhere so started to de-activate each plugin to see at what point the problem stopped.
Three hours later, A miracle happened !!!!!
I deactivated another plugin feedwordpress
Guess what !!! I now have widget power
I'm a happy guy at last, but its taught me a valuable lesson..
Maybe this may help someone
good luck all. Mike