When deleting an attachment in backen I get a white screen on one av my sites. I don't even get the confirmation popup.

Any idéas??

// Olle - Celona

If the image you posted is what your refering to as a white screen, try refreshing the page and or clicking on the content tab, since there is no longer an image to show on that tab.
If you are getting a true white screen (nothing) set joomla error reporting to highest in global settings and try to get an error message that will point to the problem.