Kubuntu 9.04 - Can't drag application from one screen to another in multi monitor setup

"the reason you can't drag windows from one 'head' onto another 'head' is (as
CarlF correctly commented) that your setup is in ""separate x display"" mode and not in ""xinerama mode"" (aka ""twinview in nvidia-land or ""bigdesktop"").

such a ""separate x display"" setup means, that each head can possibly run a completely different configuration regarding visual depth, size, framerate etc. thus, a window created on one head (the term is actually ""screen"") can not be savely moved onto the other head because the ""pixels do not match"".

checkout
http://ubuntuforumsdotorg/showthread.php?t=221174 and configure your xserver correctly, then your problems will vanish .)"