If I click ALT+F2 the open System Monitor, the command window (The rectangle at the top) remains appearing at all desktops as shown in Bug1.png. If I close System Monitor, I get error as shown in Bug2.png. If I open it from start, the whole start lags as shown in Bug3.png, After closing it, I get the same error as shown in Bug4.png Reproducible: Always I use Kubuntu 15.04 Beta 1.
Created attachment 91420 [details] Bug1.png
Created attachment 91421 [details] Bug2.png The error.
Created attachment 91423 [details] Bug3.png Everything lags in the down bar.
Created attachment 91424 [details] Bug4.png The same error as Bug2.png.
*** This bug has been marked as a duplicate of bug 343673 ***