Can`t change the widgets
 

Hello,
I put the widgets at the left and the right sidebar. Now I want to change them but I can't delete them. What could be the problem?
Bye
Carsten

Have you clicked "Remove" on the widget itself, followed by "Save changes" at the bottom?

When I press the button nothing happens. I have to copy the link of the button and put it manualy in the browser.

Does it work with the "default" theme? Looks like you're missing some Ajax/Javascript functionality.