Hi,
I just encountered this very strange behaviour in Atahualpa where I can not any widgets to my right sidebar (www.urgeschmack.de) - I can change the order of those that are there, can remove and add them again and all is fine. But any additional widget I try to add from the "Better Blogroll" to the simple text widget just won't get displayed on the website. And as soon as I leave the Widgets-page in the backend and return, the newly added widget will be gone from that area.

What could cause this?

it is probably a plugin conflict. try disabling ALL your plugins and see if that fixes it, then add them in a couple at a time till you find the culprit

Once again, juggledad: Thanks a lot. Turned them off and on in groups and now everything is fine and every plugin can stay.