kubuntu 14.04 cannot drag and drop icons from desktop to panel

Hi I installed in a 2 laptop kubuntu 14.04 and the latest trinity version found in deb http://mirror.xcer.cz/trinity-sb trusty deps-r14 main-r14 deb-src http://mirror.xcer.cz/trinity-sb trusty deps-r14 main-r14 I set an icon in the desktop, emacs 25 which I just compiled. Everything was as always but when I tried to drag and drop that icon over to the panel in it not work, the icon did not «entered» the panel. I have done this for years for non tde applications, what happened. Is this feature now disabled? thanks Uwe Brauer