[Bug 255431] New: shadow rectangle on background: disappears turning off and on compositing

[Andrea Z.]

https://bugs.kde.org/show_bug.cgi?id=255431

           Summary: shadow rectangle on background: disappears turning off
                    and on compositing
           Product: kde
           Version: 4.5
          Platform: Gentoo Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: unassigned-bugs at kde.org
        ReportedBy: krog.az at gmail.com


Created an attachment (id=52915)
 --> (http://bugs.kde.org/attachment.cgi?id=52915)
screenshot

Version:           4.5
OS:                Linux

Not always, but often, when I login there is a rectangle made just by shadow
(as the shadow of a window, black colour) on top-left of my screen.
To make it disappear I have to turn off compositing and then turn it on.
During this two moves, for just a moment this rectangle becomes fully black.
This happens also with another user on the same machine.


Reproducible: Sometimes

Steps to Reproduce:
Just log in.

Actual Results:  
turning off and on the compositing removes it until next login.

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