Version: (using Devel) Installed from: Compiled sources OS: Linux To reproduce: Move a plasma applet so that some is on one display and some on another display, move it backwards and forwards in this position a few times and the section on one display will dissappear and stay hidden. http://bw.uwcs.co.uk/b/kde4_bugs/plasma_xinerama_cutoff.png If you then zoom out it will display the cut off applet twice: http://bw.uwcs.co.uk/b/kde4_bugs/plasma_xinerama_cutoff_zoom_out.png
I have the issue here too... but : it works if my mouse cursor is on the destination screen while dragging. Don't know if that's clear :)
each screen has its own view and containment. they are not intended to be contiguous.