HeidiSitara

You are right Mugsy. It was nothing like that.

Everything was set up right, what I had to do was, in my FTP browser, to copy the admin and content folder back, not once ( the first time nothing changed), but twice. Not to be understood, but after the second time, everthing worked.

And, not to forget, this was replicas of the same folders!

I am not insinuating your answer was not serious, just that the instructions were not accurate enough, and that I probably needed more help if I should make it work.

When i said things got messed up, this is just what happened. I could not open the Home page, only some errors showed up. I should probably have copied them.

After deleting the wp-admin and wp-content and replaced with new folders without any luck, I replaced them once again with the same folders from an other WordPress blog I have and which works fine. This also caused a mess, with error messages.
So finally I deleted also this ones and restored the ones I had before I followed the first advice here to delete and upload.

Strangely enough, after copying back my original folders the second time, the widgets and the menus worked!

So, after all, it all worked out. Thanks!

That was a very bad idea.

By deleting the folders and uploading fresh ones from the server, everything got messed up. Fortunately i had a backup, so I could restore again.

If I should upload the folders again, I guess a few things must be modified, and i am not a technical person to do so, without some guidance..

If this was a serious attempt to help, please provide some further instructions.

I have a clean fresh 3.1. install
-no active plugins
-only Twenty Ten theme

The widgets can′t be dragged
The Screen option button does not work, neither do the Help button

When I compare the two installations this one and an old and upgraded version which seems to work fine in 3.1), I can see that in the new one (which does not work), as I click on the Screen options menu up on left corner in the widget page, the following comes up in my browsers url address line:
https://fjeldvig.no/GenblogEN/wp-admin/widgets.php#screen-options
When I do the same in the WordPress I upgraded, and which does work, only this comes up when I press the menu:
https://blogg.fjeldvig.no/wp-admin/widgets.php (there is no “#screen-option” added)

The same happens when I press the “help” button: “#contextual-help” is added to the url.

I have to add:

I can also not use the menu “Screen options” or “Help” on the widget page or any other page.

When I compare the two installations, I can see that in the new one (which does not work), as I click on the Screen options menu up on left corner in the widget page, the following comes up in my browsers url address line:
https://fjeldvig.no/GenblogEN/wp-admin/widgets.php#screen-options
When I do the same in the WordPress I upgraded, and which works, only this comes up when I press the menu:
https://blogg.fjeldvig.no/wp-admin/widgets.php (no #screen-option)

The same happens when I press the “help” button #contextual-help is added.

I have no plugins activated, and use the WordPress Team that came as standard.